小嘴乌鸦繁殖习性的初步观察

小嘴乌鸦(Corvus corone orientalis Eversmann)是北方农村和城郊较常见的鸟类,与人类经济活动关系密切。目前国内尚无小嘴乌鸦生态习性方面的研究报道。笔者于1988年4月至1990年10月在新疆霍城、尼勒克、哈巴河和沙雅等地的农区、林区进行了调查。现就其繁殖习性报告如下。 1.营巢及巢新疆北部的小嘴乌鸦喜集群营巢,置巢于阔叶乔木林中,一棵树上最多15个巢,多位于树的中部或上部。树种以杨、桦、榆、槭树等为主,偶然也有在檐洞或崖洞中营巢的。而在新疆南部的沙雅则较少见到集群筑巢,且置巢于胡杨树上。

A Preliminary Observation on the Reproductive Habits of Carrion-Crow

The study was conducted during the springs to summers of 1988 through 1990 in Xinjiang. In late March Carrion-Crow (Corvus corone orientalis)began to build their nests in the broadleaf forest or sometimes in a cove. The crow laid 4-8 eggs and the average size was 45.4-29.3mm, The incubation lasted about 19 days and the young birds were fledged in about 4 to 5 weeks.