SPECIES PROFILE · Birds of prey

Eurasian sparrowhawk

Accipiter nisus · Linnaeus, 1758

The smallest European Accipiter — fast, maneuverable, the most frequent guest at bird feeders.

The Eurasian sparrowhawk is the smallest European representative of the genus Accipiter — a predatory bird that fits within the wingspan of a jackdaw but reaches speeds of 50 km/h during attacks at feeders. It is the most frequently observed urban predator at garden feeders: lightning-fast, maneuverable, with a characteristic glide from behind a hedge. The adult male has decorative rusty-orange bars on its chest, while the female is larger and browner — a reverse sexual dimorphism typical of the Accipitrid family.

28–38 cm: body length
55–78 cm: wingspan
110–195 g: male mass
185–342 g: female mass
50–150 ha: pair territory
4–7 eggs: clutch size
33 days: incubation
20–30 thousand: pairs in PL

LC Least Concern Strict protection in PL (Regulation of the Minister of Environment of 16.XII.2016); EU Birds Directive; zonal protection recommended in Natura 2000 areas Stable — Polish population approx. 20–30 thousand breeding pairs; significantly more numerous in urbanized areas due to prey availability at feeders

In short

Smallest European Accipiter — the male weighs as much as a jackdaw, the female as much as a feral pigeon
Clear reverse sexual dimorphism — females are 50–75% heavier than males
Male is rusty-orange, female is brownish-gray — a key distinction in the field
Most common bird of prey at feeders in urban areas across Poland
Diet is 95–98% small songbirds — sparrows, tits, chaffinches, blackbirds
Hunting technique: glide from behind a hedge, 50 km/h attack, escape to pluck
Tail is proportionally longer than a goshawk's — a key flight characteristic
Plucking sites — clumps of prey feathers on the ground — a diagnostic sign of presence

Classification

Kingdom	Animalia
Phylum	Chordata
Class	Aves
Order	Accipitriformes
Family	Accipitridae
Genus	Accipiter
Species	A. nisus

The Eurasian sparrowhawk (Accipiter nisus), along with the northern goshawk, is one of two representatives of the genus Accipiter in Polish avifauna. It is significantly smaller — the male weighs only 110–195 g, the female 185–342 g — and much more numerous than its larger cousin (20–30 thousand breeding pairs in PL vs 6–8 thousand pairs of goshawks). The sparrowhawk is a specialist in small songbirds: sparrows, tits, chaffinches, blackbirds, and thrushes constitute 95–98% of its diet. Its characteristic hunting technique is surprise from ambush — a gliding flight from behind a hedge, gate, or building corner, a lightning-fast grab at the feeder, and an escape to a safe spot where the bird is plucked. Plucking sites — clumps of feathers on the ground under a branch or on a lawn — are a diagnostic sign of the sparrowhawk's presence in an urban garden. Unlike the goshawk, the sparrowhawk is even more strongly synanthropic — in cities, it is often more numerous than in the forest, taking advantage of the dense prey population at human feeders.

Appearance and Sexual Dimorphism

The smallest European Accipiter — the male is elegant, the female is more massive. Every detail of the plumage speaks of sex and age.

The sparrowhawk has the most pronounced sexual dimorphism among Polish birds of prey. The male weighs 110–195 g, the female 185–342 g — a weight difference of up to 200%. This is not just cosmetic — the male hunts smaller songbirds, while the female hunts larger ones (tits vs thrushes), which separates ecological niches within the pair.

Body length 28–38 cm, wingspan 55–78 cm. The male is smaller in every dimension — shorter wings, lighter body, slenderer silhouette. In the city, the difference is obvious: a male can be mistaken for a large blackbird, a female for a small goshawk. Short rounded wings and a long tail — proportionally longer than a goshawk's — are key flight features, giving the sparrowhawk an advantage in maneuvers through thickets.

Adult male plumage is ornamental — a blue-gray back with a slight metallic sheen, white underside covered with dense rusty-orange transverse bars on the chest and belly. A characteristic white eyebrow above the eye emphasizes its sharp facial expression. The female is larger, brownish-gray on the back, with brownish (not orange!) bars on the white underside. Juveniles of both sexes have a brown back and a cream underside with longitudinal and heart-shaped streaks instead of transverse bars.

Eyes change color with age — from yellow in juveniles to orange in adults (rarely reddish in very old individuals). Legs are exceptionally long and slender with long toes — an adaptation for catching birds in flight. The beak is hooked with a yellow-blue cere. The female and male have nearly identical proportions; differences are purely in size and plumage coloration.

Male — rusty-orange bars on the chest (key feature)
Female — brownish-gray bars, 50–75% larger
White eyebrow above the eye — diagnostic for both sexes
Long tail proportionally longer than a goshawk's
Short rounded wings — adaptation for maneuverable flight
Long slender legs — adapted for gripping birds
Eyes yellow → orange with age
Juveniles with longitudinal streaks instead of transverse bars

Why the female is larger than the male

Reverse sexual dimorphism is typical for most birds of prey, but in the sparrowhawk, it reaches an extreme. Evolutionary hypotheses include: (1) niche partitioning in the pair — the male hunts small birds, the female larger ones, increasing the total biomass available for the family; (2) nest defense — the larger female effectively drives away corvids and larger predators; (3) mate selection — males must be more agile for courtship displays. The extremity of dimorphism in sparrowhawks (females up to 75% heavier) stems from the fact that the species hunts a very wide range of prey sizes — from the goldcrest (5 g) to the woodpigeon (500 g).

Anatomy of a sparrowhawk — silhouette of a male with described features: rusty-orange bars, white eyebrow, long tail, short wings — Fig. 01Silhouette of a male sparrowhawk in profile — key diagnostic features: rusty-orange bars, white eyebrow, proportionally long tail.

Feature	Sparrowhawk	Goshawk
Body length	28–38 cm	49–63 cm
Wingspan	55–78 cm	100–135 cm
Female mass	185–342 g	900–1500 g
Chest bars (male)	rusty-orange	dark transverse
Tail:wing ratio	longer tail	broader wing
Diet	small birds 95%	medium birds + mammals
Flight	fast flapping + short gliding	powerful strokes + long gliding
PL Population	20–30k pairs	6–8k pairs

Environment and Synanthropization

Common in forests, but in cities often denser than in the countryside — a phenomenon of Polish avifauna in the last 30 years.

The sparrowhawk is one of the most numerous Polish birds of prey, with a population of 20–30 thousand breeding pairs — several times more than the goshawk. It occurs throughout Poland, from Masurian forests to the Bieszczady Mountains. The last 30 years have been an era of its intense synanthropization — the sparrowhawk has become a characteristic resident of Polish cities, where locally its density is higher than in natural forests.

Natural habitats of the sparrowhawk include mixed and coniferous forests, forest edges, young plantations, field woodlots, and riverside floodplains. A key requirement: dense woodland for nesting combined with access to open spaces with populations of small birds. The sparrowhawk avoids uniform old-growth stands (that is goshawk territory) and completely open landscapes (where buzzards or harriers hunt).

Synanthropization of the sparrowhawk in Poland dates back to the 1990s, but the phenomenon has accelerated in the last 15 years. Key factor: the growing popularity of bird feeders in Polish gardens and parks, along with the increase in sparrow, tit, and tree sparrow populations in winter. The sparrowhawk found inexhaustible hunting grounds. First documented urban nests in PL: approx. 1985 (Warsaw), 1990 (Krakow). Today, the sparrowhawk nests in urban parks, large gardens, cemeteries, and green areas near housing estates.

Winter range: most Polish sparrowhawks are sedentary or short-distance migrants. In winter, individuals from Scandinavia and the Baltic countries arrive in Poland, concentrating primarily in cities — where prey density at feeders is highest. This explains the winter boom of sparrowhawk sightings in Polish cities: attacks on sparrows under feeders become a daily occurrence.

Mixed and coniferous forests — natural habitat, nesting
Forest edges and young plantations — hunting grounds for small birds
Field woodlots — migration corridors and hunting
Urban parks with large trees — growing trend since the 90s
Cemeteries and large gardens — peaceful nesting sites in the city
Bird feeders — key winter hunting grounds in urbanized areas

Polish urban park in autumn — old deciduous trees and a feeder with a flock of sparrows, typical sparrowhawk hunting ground — Fig. 02A typical urban sparrowhawk hunting ground — a park with old trees and a feeder with a flock of small birds.

Diet — Almost Exclusively Small Birds

95–98% small songbirds. The rest are exceptions that prove the rule.

The sparrowhawk is the most specialized among Polish Accipiters in terms of diet. Almost all the energy it acquires comes from small songbirds — Polish studies show they account for 95–98% of prey biomass. The rest are incidents, not a strategy.

The spectrum of prey is determined by sex and size. The male (110–195 g) hunts smaller birds: great tits, marsh tits, chaffinches, tree sparrows, house sparrows, long-tailed tits, goldcrests, blue tits, siskins, bullfinches. The female (185–342 g) — larger ones: blackbirds, thrushes, feral pigeons, jackdaws, wrynecks, woodpeckers, jays (rarely, at the limit of ability), even young crows and magpies. This niche separation within the pair allows sparrowhawks to effectively exploit the entire spectrum of available small birds.

Hunting technique relies on surprise and maneuver. The sparrowhawk hunts from ambush — from a bush branch, a low tree, or a building corner. In an urban garden, a typical attack is a gliding flight from behind a hedge, slipping over a roofline, a lightning-fast grab of prey at the feeder, and an escape to a safe place with the prey in its talons. Attack speed — up to 50 km/h in a direct line. In the forest, the sparrowhawk uses gliding flight between trunks — pushing through thickets with maneuvers impossible for the larger goshawk. This is a documented aerial skill, unseen in other European birds of prey except the sparrowhawk.

Prey consumption occurs at a plucking site — a safe place (branch, post, tree, roof). The sparrowhawk first plucks the larger feathers, especially wing and tail feathers, only then beginning to eat. Feathers scattered in a 1–3 m radius around the plucking site are a diagnostic sign of presence. A small clump of feathers = male after small prey; a large plucking site with pigeon feathers = female after large prey.

Sparrowhawks and feeders — what to do when they hunt your guests

A sparrowhawk attacking sparrows at a feeder is natural, legally protected behavior — none of the Polish predatory bird species may be harassed, let alone killed. If you attack a sparrowhawk, you are breaking the law (Regulation of the Minister of Environment of 16.XII.2016, strict protection). What you can do: (1) place the feeder 2–3 m from a dense bush or hedge — small birds will have a place to escape; (2) use a feeder with a roof that blocks the view from above; (3) accept it — a sparrowhawk takes 1–2 birds a day, but a flock of 50 sparrows remains a flock of 50 despite this (reproduction compensates for losses); (4) treat it as a nature bonus — few have the opportunity to observe a hawk hunting 5 meters from their kitchen window.

95–98% of diet — small songbirds
Male — smaller prey (5–80 g): sparrows, tits, chaffinches
Female — larger prey (up to 500 g): blackbirds, pigeons, jackdaws
Technique: surprise from ambush, glide from behind hedges
Attack speed up to 50 km/h in a direct line
Plucking sites — feathers scattered 1–3 m around the eating spot
Occasionally — small mammals (mice), insects, occasionally bats

Reproduction and Care of the Young

Late spring breeding, larger clutch than the goshawk — but the nest is used for only one season.

The sparrowhawk is monogamous for the season, but with less fidelity to the nest and partner than the goshawk. Pairs form in early spring, and most nests are built anew every year — often in a different place or on a different tree. This is a defensive strategy: an old nest is a known location for predators (marten, jay).

The breeding season begins in April — pairs perform courtship displays over the future nest site: slow flights with deep wing beats, glides in opposite directions. Males deliver food to females as part of courtship (courtship feeding). Clutch occurs in May–June; the nest is on a tree 5–15 m above the ground, in a small fork, usually in a thicket of spruce or old oaks. The nest is smaller and less durable than a goshawk's — a loose construction of twigs and moss, 30–50 cm in diameter.

The clutch consists of 4–7 eggs (more than the goshawk, which has 2–4) — white-blue eggs with brownish spots. Incubation lasts 33 days, performed mainly by the female; the male delivers food to her at the nest or nearby. Chicks are born blind, covered in white down; they open their eyes on the 4th day and leave the nest on the 28–32nd day. After leaving the nest, the young stay in the vicinity for 3–4 weeks, practicing flight and hunting, still fed by parents. Full independence: at 7–8 weeks of age.

Asynchronous hatching and nest hierarchy

Sparrowhawk eggs are laid every 1–2 days, and incubation starts from the first (or second) egg. The result: chicks hatch at intervals of several days, creating an age and weight hierarchy in the nest. In lean years, younger chicks cannot keep up with the competition for food and die of starvation (cannibalism in the nest is documented). This is a brutal but evolutionarily optimized strategy: in abundant years, all 6–7 chicks grow up; in lean ones — the 2–3 strongest survive. This mechanism occurs in most birds of prey but is particularly distinct in the sparrowhawk due to large fluctuations in the availability of small prey birds.

Three sparrowhawk chicks in a nest on a spruce — white downy plumage, asynchronous development visible in size — Fig. 03Sparrowhawk chicks at 14 days old — clear asynchronous development with two older and two younger chicks.

Tracks and Signs of Presence

The sparrowhawk is rarely seen — but it leaves clear diagnostic signs on the ground that cannot be missed.

Direct observation of a sparrowhawk during a hunt is spectacular but rare — the attack lasts 2–3 seconds. It is much easier to find evidence that it hunted here: plucking sites, pellets, feathers in hedges, characteristic tracks in the snow under a feeder.

Plucking sites are the most common sign of a sparrowhawk's presence. Diagnostic features: a circular scattering of prey feathers in a 1–3 m radius around the center (branch, post, low stone, garage roof); feathers are plucked or torn at the base (the sparrowhawk pulls them out, rather than cutting them), with feather fibers visible; wings and tails are often preserved (the sparrowhawk doesn't eat them, leaves them in place). Location: under a dense hedge, in thickets of bushes, on a low wall by a park, on a garden shed roof. Fresh plucking sites preserve feathers in perfect condition for 1–3 days.

Sparrowhawk pellets are distinctly smaller than owl pellets (1–3 cm long, cylindrical, dark gray), containing feather fragments and small bones. Unlike owl pellets, the sparrowhawk digests most bones (it has stronger enzymes), so the pellet is mainly feathers compressed into a smooth, cylindrical capsule. Sparrowhawk droppings are characteristic — white splashes near the nest, sometimes 2–3 m from the trunk (direction aimed by chicks or adults). This helps locate the nest even in a dense tree crown.

Tracks in the snow are diagnostic for rural areas and urban parks. After a hunt, the sparrowhawk lands on the ground to pluck its prey — leaving a characteristic pattern: scattered feathers in the center, its own footprints (small, long-toed, with claw marks, diameter 4–5 cm), sometimes dusted rings of snow from the prey's feathers. Unfrozen blood on the snow combined with scattered feathers = a fresh sparrowhawk hunting site.

Plucking sites — circular scattering of feathers 1–3 m, torn at the base
Pellets — small cylindrical (1–3 cm), mainly feathers
White droppings 2–3 m from the nest — diagnostic for location
Tracks in snow with scattered feathers and claw marks
Prey feathers under a feeder — indicator of regular presence
Uneaten rear parts — the sparrowhawk eats half the prey and flies off
Contact call — fast repeated 'kek-kek-kek' during breeding (IV–V)

Fresh sparrowhawk plucking site under a feeder — a clump of sparrow feathers scattered within a meter radius on the snow — Fig. 04A fresh sparrowhawk plucking site under a feeder — diagnostic clump of feathers and footprints in the snow.

Behavior and Lifestyle

Small, fast, territorial — the sparrowhawk lives life in sprints. Each day is a series of lightning-fast attacks and long breaks for observation.

The sparrowhawk leads a monogamous and territorial lifestyle — a pair jointly defends a territory of 50–150 ha (in the city it can be much smaller, up to 20 ha) against other sparrowhawks. Daily activity has two peaks: morning (6–10) and before sunset (15–19), with a midday break for digestion and rest.

The territory of a sparrowhawk is flexible and strongly dependent on food availability. In a primary forest with a low population of small birds, a pair needs 100–150 ha; in an urban park with numerous feeders, 20–40 ha is enough. Territory boundaries are defended mainly during the breeding season (III–VI) — patrolling, courtship displays, aggressive driving away of strange sparrowhawks. Outside the season, tolerance is greater, and young individuals move in search of vacant territories.

Vocal communication is discrete — the sparrowhawk does not have an extensive repertoire like the buzzard. Its characteristic sound is a fast repeated 'kek-kek-kek-kek' (8–12 times per second), audible mainly during the breeding season IV–V — warning, territorial, or contact between partners at the nest. Chicks beg with a not very loud, whistling 'pii-pii'. Most communication is via visual signals — posture, wing arrangement, and displays on a branch.

Migrations: most Polish sparrowhawks are sedentary or short-distance migrants. Part of the North European population (Scandinavia, Baltic) winters in PL, concentrating in cities where small bird populations are stable thanks to feeders. In spring they return to breeding grounds; in March–April, nocturnal migration of young individuals is common. The winter expansion into Polish cities is a phenomenon of the last 30 years, correlating with sparrow and tit populations.

The sparrowhawk and other predators — coexistence in a Polish garden

In a Polish city, the sparrowhawk is not alone. It competes (and coexists) with: the domestic cat (the cat attacks the feeder from the ground, the sparrowhawk from the air — they share the same prey but using different methods), the goshawk (larger cousin, common in cities after 1995, attacking feral pigeons — different prey niches), the stone marten (attacks sparrow and tit nests at night — the sparrowhawk does not attack those sitting on nests), and the jay (a nest predator, but also prey for the female sparrowhawk in difficult years). The local food web is dense — the sparrowhawk fits in as a specialist in surprise in full daylight.

Protection and Threats

Strict protection, but real threats lurk both in the forest and in the city — and some of them come indirectly from humans.

The sparrowhawk, despite being common, is fully covered by strict species protection in Poland — since 1981 (after earlier decades of persecution). Its protected status allowed the population to recover from a dramatic decline in the 60s and 70s (when DDT and other organochlorine pesticides nearly wiped out the national population).

Legal status: strict protection in Poland (Regulation of the Minister of Environment of 16.XII.2016, Annex 1); EU — Annex I of the Birds Directive (species subject to special conservation measures in Natura 2000 areas); CITES — Annex II (trade regulation). Zonal nest protection is not mandatory but recommended in Natura 2000 areas (a 100–200 m zone during III–VIII).

Main threats: (1) Glass collisions — in cities, this is the single largest cause of sparrowhawk mortality; it is estimated that 2–5% of the urban population dies annually on building windows, especially office buildings reflecting the sky. (2) Secondary rodenticide poisoning — rodenticides accumulate in sparrowhawks' livers through prey, causing internal bleeding. (3) Collisions with power lines and cars. (4) Old-growth logging of suitable nest trees. (5) Illegal persecution at pigeon lofts (less frequent than with goshawks, but still recorded).

The sparrowhawk as a bioindicator is classic — it was one of the species for which the negative effects of organochlorine pesticides (DDT) were first documented. In the 60s and 70s, populations in the UK and Poland fell by 70–90% due to thin eggshells (DDT disrupted calcium metabolism). After DDT was banned (PL — 1976), the population consistently recovered. Today, the sparrowhawk is an indicator of urban avifauna health — its presence indicates healthy populations of sparrows, tits, and other prey.

Strict protection in PL since 1981; EU Birds Directive Annex I
Glass collisions — largest cause of urban mortality (2–5% per year)
Secondary rodenticide poisoning — bioaccumulation in the liver
Collisions with lines and cars — especially in rural areas
Old-growth logging — loss of nesting sites
Illegal persecution at pigeon lofts — rare but recorded
Bioindicator indicator — historic for DDT, today for avifauna health
Nest boxes — a possible form of support in areas with a deficit of cavity-bearing trees

Myths and Facts

Common misunderstandings about the sparrowhawk — from the 'male goshawk' to the 'killer at the feeder'.

The sparrowhawk is a species that is exceptionally visible but exceptionally misunderstood. Its attacks at urban feeders generate emotional reactions, and its resemblance to the goshawk leads to fundamental identification errors. Six common myths are explained below.

MYTH The sparrowhawk is a male goshawk.

FACT False. The sparrowhawk (Accipiter nisus) and the northern goshawk (Accipiter gentilis) are two different species of the same genus. The mistake comes from reverse sexual dimorphism — a female sparrowhawk (up to 342 g) is smaller than a male goshawk (up to 900 g), so in the field, they look like different sizes of the same bird. Diagnostics: the sparrowhawk always has a proportionally longer tail and shorter, narrower wings; the goshawk has a larger head with a more pronounced eyebrow.
MYTH Sparrowhawks attack humans and pets.

FACT Physically impossible. A male sparrowhawk weighs 110–195 g (like a large blackbird), a female 185–342 g (like a feral pigeon). It lacks the mass and strength to attack a human, dog, or cat. In defense of its nest, it may perform diving warning flights over a head, but not attacks. Documented 'attacks' are always misinterpretations of defensive behavior.
MYTH A sparrowhawk will wipe out all birds at a feeder.

FACT Exaggerated. A sparrowhawk takes 1–2 small birds a day, sometimes fewer during periods of low activity. A flock of 50 sparrows at a regular feeder in a Polish garden remains a flock of 50 — they compensate through reproduction and immigration. Local regulation, not elimination. In a healthy ecosystem, the sparrowhawk is an indicator of small bird abundance, not a threat to them.
MYTH Sparrowhawks only hunt small birds.

FACT Partially true, but simplifying. Female sparrowhawks regularly hunt feral pigeons (300–400 g), blackbirds (90–120 g), jackdaws (220–270 g), and thrushes (60–110 g). Their upper limit is the jay (170–190 g) — prey at the limit of their capability, taken occasionally. Males specialize in smaller prey, females in larger ones — this is intra-pair niche partitioning.
MYTH Sparrowhawks kill birds for fun or leave prey uneaten.

FACT False. A sparrowhawk consumes everything it kills; the remains at plucking sites are inedible parts — large wing and tail feathers, and the skin of some prey. Rear parts of prey may remain uneaten if the hawk was startled — it will return for them later. Waste in hunting is energetically impossible for predators — every bird caught must be worth the energy spent.
MYTH You can keep a sparrowhawk as a falconry bird.

FACT In practice, no. The sparrowhawk is under strict species protection in PL and the EU. Falconry (active hunting with a bird) is legal, but: (1) requires a falconry license (state exam, courses); (2) the bird must come from legal breeding with CITES certificates — taking one from the wild is illegal; (3) the sparrowhawk is technically difficult in falconry — fast and maneuverable, but with a short active hunting time. Most falconers choose goshawks, peregrine falcons, or Harris's hawks.

Eurasian sparrowhawk

In short

Classification

One letter from the field, every month.