Sparrowhawk Diet and Size: Feeding Habits, Predators, and Measurements
The Sparrowhawk (Accipiter nisus) is a remarkable bird of prey that has adapted remarkably well to both woodland and urban environments across the UK. These agile hunters are known for their exceptional flying skills and distinctive hunting techniques.
With notable size differences between males and females, Sparrowhawks showcase one of the most pronounced examples of sexual dimorphism among British birds of prey.
In this article, let’s learn about the Sparrowhawk’s dietary habits, size, breeding behaviours, and its conservation status to understand more about this fascinating bird!
Table of Contents
The Dietary Habits Of The Sparrowhawk
Sparrowhawks are specialised avian predators, with hunting strategies that vary between males and females due to their size differences.
What Does A Sparrowhawk Eat?
Sparrowhawks are highly specialised bird hunters, with their diet consisting primarily of small to medium-sized birds. They have been recorded preying on an impressive range of 120 different bird species in the UK.
Male Sparrowhawks, being smaller, typically hunt birds up to thrush size, focusing on species like finches, tits, and sparrows. Their smaller size allows them to manoeuvre efficiently through dense vegetation in pursuit of these agile prey species.
Female Sparrowhawks, with their larger size and stronger build, can tackle more substantial prey, including birds up to pigeon size. This size difference between males and females reduces competition for food resources within the species.
Interestingly, some Sparrowhawks have also been observed hunting bats, particularly during dawn and dusk when these mammals are active. Despite their fierce reputation, Sparrowhawks have a relatively low hunting success rate of about 10%.
What To Feed A Baby Sparrowhawk?
Baby Sparrowhawks, or nestlings, are entirely dependent on their parents for food. During their first weeks, they require a protein-rich diet that aids in their rapid growth.
In the wild, parent Sparrowhawks deliver small birds to the nest, tearing pieces of flesh for the nestlings to consume. This diet, rich in protein, is essential for their development, providing the strength needed for eventual flight.
Breeding Habits Of Sparrowhawks
Sparrowhawks have fascinating breeding behaviours that showcase their adaptability to various habitats.
Do Sparrowhawks Mate For Life?
Sparrowhawks do not mate for life but tend to form seasonal pair bonds. They often return to the same nesting territory each year, though not necessarily with the same partner.
Breeding pairs typically form in early spring, with spectacular aerial displays by both birds. The male performs elaborate flight displays, including slow-motion flying to attract a mate.
Nesting typically occurs in woodland areas, with the pair building a new nest each year, usually in a tree fork close to the trunk. The female lays 4 to 5 pale blue eggs with brown spots, which she incubates for about 32 to 34 days.
The Size & Weight Of Sparrowhawks
Sparrowhawks exhibit remarkable sexual dimorphism, with females being notably larger than males.
How Much Does A Sparrowhawk Weigh?
Sparrowhawk weights vary significantly between males and females due to sexual dimorphism. Adult males typically weigh between 110 to 196 grams, while females are notably heavier, ranging from 185 to 342 grams.
This size difference, which is common among birds of prey, allows Sparrowhawks to reduce competition for food. Males are adept at hunting smaller birds, while females, with their increased weight and strength, can tackle larger prey.
How Big Is A Sparrowhawk?
The Sparrowhawk’s size also varies between genders, with males measuring around 28 to 34 centimetres in length, and females reaching up to 38 centimetres. The wingspan ranges from 55 to 70 centimetres, providing excellent agility and allowing these raptors to fly at high speeds and navigate through dense foliage.
Their body is streamlined for swift, sudden attacks, making them exceptionally effective at capturing birds in flight or from tree branches.
Are Sparrowhawks Under Threat?
Sparrowhawks are currently Amber-listed in the UK Birds of Conservation Concern list, indicating moderate conservation concern.
Globally, they are classified as Least Concern on the IUCN Red List.
What Eats A Sparrowhawk?
Despite being predators themselves, Sparrowhawks face threats from larger birds of prey, particularly Goshawks and Eagle Owls. Their eggs and chicks are vulnerable to predation by martens, squirrels, and crows.
Adult Sparrowhawks are occasionally taken by larger owls, particularly during winter when food is scarce. However, their main threats come from human activities rather than natural predators.
Where Can I See Sparrowhawks In The UK?
Sparrowhawks can be found throughout the UK in woodlands, parks, and increasingly in urban gardens. They are present year-round, though some birds move to different areas in winter.
They are particularly visible during the breeding season when they perform aerial displays. Urban areas with mature trees and good populations of small birds often support resident Sparrowhawks.
Popular locations for spotting Sparrowhawks include the New Forest in Hampshire, Kielder Forest in Northumberland, and many RSPB reserves across the country. Garden bird feeders also provide excellent opportunities to observe these skilled hunters in action.
SEE ALSO: Sparrowhawk Life Cycle: Nest Building To Fledging (and everything in between)
Frequently Asked Questions
The scientific name of the Sparrowhawk is Accipiter nisus.
In the wild, Sparrowhawks generally live up to 4 years, though some individuals have been recorded living over 20 years under favourable conditions. Survival rates in the wild can be challenging due to predation, environmental changes, and the high energy costs of hunting.
Sparrowhawks produce high-pitched, sharp calls, particularly during the breeding season. These calls are used for communication between mates and are also essential in defending their territories from rival raptors.
