Different raptor species in the Arctic nest at least 700 to 1,800 meters apart — except for the Rough-legged Hawk.
Tag: the auk
Global warming is increasingly affecting wild bird populations, and because the Arctic is warming more rapidly than any other part of the world, populations of Arctic migratory birds are potentially the most vulnerable.
Dialects, a well-known feature of human languages, can also be found in the vocalizations of various bird species.
Reproduction and migration are the two most demanding tasks in a bird’s life, and the vast majority of species separate them into different times of the year.
Few groups of organisms possess striking visual displays that rival the bright colors and intricate patterns of bird feathers.
There’s no shortage of studies demonstrating that conditions during one part of birds’ annual of breeding and migration cycle can affect individuals in subsequent stages — a phenomenon known as carry-over effects.
We usually think of a species as being reproductively isolated – that is, not mating with other species in the wild. Occasionally, however, closely related species do interbreed. New research just published in The Auk: Ornithological Advances documents the existence of a previously undiscovered hybrid zone along the coast of northern California and southern Oregon, …
I am lucky that one of the species of hummingbird I study, the Blue-throated Starfrontlet (Coeligena helianthea), occurs on my university’s campus in the mountains of Bogotá, Colombia.
One of the daily joys of summer is waking to the sounds of bird song. Those early morning bursts of singing herald the start of our days, for birds and people alike. If we listen carefully, though, the dawn chorus also reveals something about the state of nature.
The latest supplement to the American Ornithological Society’s checklist of North and Middle American birds is being published in The Auk: Ornithological Advances, and it includes several major updates to the organization of the continent’s bird species. The official authority on the names and classification of the region’s birds, the checklist is consulted by birdwatchers and …