Flock of Canadian geese flying overhead on clear blue sky background. A number of birds flying just overhead isolated on blue. Bird seasonal migration.,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素
外部播放此歌曲> Bird Show of North America - Canadian Geese Migration 专辑:Murder Over Moscow 歌手:Bird Show of North America 还没有歌词哦
The individual plover whose route is plotted on this map was captured in the National Petroleum Reserve in Alaska before flying across the Canadian far north.1The plover made a multi-day non-stop crossing of the Atlantic Ocean before flying across Brazil, ending up in Argentina where it spent...
After high mortality rates in blackbirds during the first two years of emergence of USUV, in the following years increasing rates of seropositive birds were detected in Austria which gave evidence for a continuing circulation of USUV with a somewhat lower pathogenicity, inducing an herd immunity ...
(Fleminget al. 1993). It has since been used in other migratory species, including lesser snow geese (Chen caerulescens), in which it was used to infer the wintering origin (Alisaukaset al. 1993). More recently, other stable isotopes, such as nitrogen and strontium, have been added to ...