2016. Population trends for North American winter birds based on hierarchical models. Ecosphere 7(5):e01351. [online]: URL: http://onlinelibrary.wiley.com/ doi/10.1002/ecs2.1351/full http://dx.doi.org/10.1002/ecs2.1351Soykan, C. U., J. Sauer, J. G. Schuetz, G. S. LeBaron, K. ...
Thousands of teaching photos of over 700 North American bird species; 900+ \"test yourself\" ID question photos; also Galapagos, Costa Rica, Ecuador
The Birds of North America From Grouse to Anhinga Part 1 of a List and Photo Gallery of North American Birds compiled by Armas Hill Noting birds found during Focus On Nature Tours in Alaska, Arizona, British Columbia, California, Colorado, Delaware, Florida, Iowa, Kansas, North Carolina, Nebr...
Instead, size was negatively correlated with temperature in the previous year, and long-term trends were associated with the direction of natural selection acting on size over the winter:species undergoing the strongest selection favoring small wing chord showed the most rapid long-term declines in ...
Population declines in North American birds that migrate to the Neotropics. Proceedings of the National Academy of Sciences USA 86: 7658 – 7662 . ,Chapa... CV Leonardo,Robinson Scott K - 《Auk》 被引量: 0发表: 2007年 Blue-winged Teal (Anas Discors) wintering in the Neotropics After bree...
An Chunlin, an expert with Hebei provincial forestry and grassland bureau, said that, while this winter is colder than usual, there are still more than 60,000 birds wintering in the reserve, which provides them with a good habitat and abundant food. ...
To South Americans, robins(知更鸟) are birds that fly north every spring. To North Americans, the robins simply vacation in the south each winter. Furthermore, they fly to very specific places in South America and will often come back to the same trees in North American yards the following...
SHIJIAZHUANG, Jan. 17 (Xinhua) -- More than 50,000 migratory birds spanning over 60 species have come to the Hengshui Lake in north China's Hebei Province to spend the winter, indicating improvements in the local ecological environment. ...
American Pipit – added fall/winter ‘North American’ Eurasian Tree Sparrow – gets full illustration (used to be just head) Scaly-breasted Numia – adult replace; juvenile added Cassia Crossbill(head of adult male) Errors Here are the few errors that I noticed. ...
The two/three North American subspecies are further separated into four subpopulations based on genetics, location of breeding and wintering areas, and migration routes. This goose breeds from the low to the high Arctic, and migrates long distances to wintering areas. Different subpopulations ...