B I R D S O F PREY I N C A P T I V I T Y '7

may be subject to variation. Photographic evidence indicates that although these feathers have been moulted and regrown at least once, there has been no appreciable colour change between the 1967 and 1968 moults.

Food consumption averages I kg (2 Ib) per day. The diet is chunk and ground horsemeat, supple- mented with a concentrated mineral mixture. Chicks, rats and fish are occasionally offered, although fish is never eaten. During the late

summer months, food consumption increases markedly.

The authors gratefully acknowledge the advice and assistance of Fred Sibley, Federal Wildlife Biologist, Bureau of Sport Fisheries and Wildlife, Endangered Species Program; Walter T. Shannon, Director, California Dept. of Fish and Game, the United States Forest Service and the National Audubon Society for providing advice on the care and main- tenance in captivity of this bird.

ACKNOWLEDGEMENTS

A note on the Honey buzzard

at Aberdeen Zoo Pernis npivorus

G E O R G E LESLIE Ahnager, Aberdeen and North of Scotland Zoological Society, Scotland

During the spring of 1968 I received a telephone call one day from a gamekeeper about 64 km (40 miles) from Aberdeen. He told me he had found an injured buzzard of a variety which he did not recognise.

On arrival at the zoo it proved to be a Honey buzzard Pernis apivorus. It had a badly damaged wing and had obviously been shot some time before. The wound was now calcified and the wing drooped badly.

After it had settled down we offered it a wide variety of food including day-old chicks, mice, rats, plucked hen, meat, liver, a wasp's nest and a

honeycomb with bee larvae and hatching bees. It refused all but the day-old chicks, mice and some hen pectoral muscle. Since then we have offered bees and wasps and also locusts and stick insects but it has consistently refused them.

Its condition has improved greatly but it can still fly only short distances at a height of up to 1.5 m (4 ft). At first it was kept on a block with short jesses to enable it to rest its wing but more recently we have put it into a large flight aviary.

We understand that this species rarely breeds in Scotland and. at the present time, there are known to be two breeding pairs only.

Breeding the White-tailed sea eagle

at Vienna Zoo Haliaeetus albicilla

W A L T E R F I E D L E R Director, Tiergarten Schonbrunn, Vienna, Austria

Our pair of White-tailed sea eagles ffaliaeetas albicilla have bred regularly in the zoo since 1961 and we believe that this is the first time that such a record has been achieved. Our pleasure has only been marred by the fact that in 1968 the chick died, probably because of bad weather. However

this year (1969) the eagles have hatched two young as if to make up for the loss.

Our pair arrived at the zoo in 1955 in juvenile plumage. They displayed and brooded even at this early age, long before the female laid any eggs. This behaviour was not unexpected, having been