Abstract
The brooding and feeding behavior of the Black-eared Kite Milvus migrans was investigated in the vicinity of Wakimisaki fishing-port, stituated at the southern edge of Nagasaki Peninsula, Nagasaki Pref., in 1983 and 1984. The results obtained are summarized as follows:
1) The brooding was mainly conducted by the female, but the male also occasionally took a part of brooding during the early nestling period.
2) Both the brooding time and the brooding period were influenced by weather and microhabitat conditions around nests, and also by the developmental phase of the nestlings. The female usually ceased to brood at about 40 days after hatching, when the nestlings were feathered.
3) The female played the greater part in feeding, and most of the foods brought to the nests were composed of fish. The parents provided the nestlings with enough food for theirr demands.
4) The sibling competition was chiefly observed in the first half of the nestling period, but pieces of foods swallowed by each nestling were approximately equal in number.
