The aim of the current study was to reveal the breeding ecology of Crowned Eagles in western Tanzania through constant daytime monitoring. The breeding circumstances of three resident pairs in the focal study area suggest that the breeding cycle of the species is seasonal, because they lay eggs in the dry season, so that fledging occurs in the rainy season. One pair brought a total of 88 prey items (a minimum of 80 prey individuals) during the breeding period from nest-making to the point at which the nestling was about to fledge at 106 days old. Prey animals comprised three vertebrate taxa (mammal, reptile and bird), of which mammals dominated, ranging over primates, rodents, carnivores, hyraxes and bovids. Diversity of prey taxa increased in the later stage of the nestling period. As well as breeding periodicity and prey selectivity, I describe details of some novel behaviours related to breeding ecology of the species, such as nest material delivery, copulation, feeding behaviour, unilateral eye closure, alert behaviour and defensive behaviour.

本研究的目的是通过持续的白天监测来揭示坦桑尼亚西部冠鹰的繁殖生态。重点研究区三对常住种群的繁殖情况表明，该物种的繁殖周期是季节性的，因为它们在干旱季节产卵，因此在雨季会发生成年现象。一对从繁殖筑巢到育雏将在106天大的时候繁殖的时期，总共带来了88个猎物（至少80个猎物）。猎物动物包括三个脊椎动物类群（哺乳动物，爬行动物和鸟类），其中哺乳动物占主导地位，遍及灵长类，啮齿动物，食肉动物，蹄兔和牛。雏鸟处于后期，猎物类群的多样性有所增加。除了繁殖周期和猎物选择性之外，