Interesting, the sparrow hawks have started killing in the garden again. Must be a 'food resource' issue. This kill was made 6ft from our kitchen door on the patio and plucking was underway at the top of the patio steps about 12 ft away.
Some info and links from Wikipedia:
Adult male Eurasian Sparrowhawks have bluish grey upperparts and orange-barred underparts; females and juveniles are brown above with brown barring below. The female is up to 25% larger than the male – one of the largest differences between the sexes in any bird species.
Male Eurasian Sparrowhawks regularly kill birds weighing up to 40 g (1.4 oz) and sometimes up to 120 g (4.2 oz); females can tackle prey up to 500 g (18 oz) or more. The weight of food consumed by adult birds daily is estimated to be 40–50 g (1.4–1.8 oz) for males and 50–70 g (1.8–2.5 oz) for females. During one year, a pair of Eurasian Sparrowhawks could take 2,200 House Sparrows, 600 Common Blackbirds or 110 Wood Pigeons. Species that feed in the open, far from cover, or are conspicuous by their behaviour or coloration, are taken more often by Eurasian Sparrowhawks. For example, Great Tits and House Sparrows are vulnerable to attack. Eurasian Sparrowhawks may account for more than 50% of deaths in certain species, but the extent varies from area to area.
Males tend to take tits, finches, sparrows and buntings; females often take thrushes and starlings. Larger quarry (such as doves and magpies) may not die immediately but succumb during feather plucking and eating. More than 120 bird species have been recorded as prey and individual Eurasian Sparrowhawks may specialise in certain prey. The birds taken are usually adults or fledglings, though chicks in the nest and carrion are sometimes eaten.
Calcium is vital and captive sparrowhawks like other need Nutrobal when young, and Arkvits when mature.