"As the birds age and gain more experience, older individuals stop exploring new places and instead move more quickly and directly, resulting in greater energy expenditure during migratory flight," ...

Somewhere in the northern Rockies, a GPS-collared gray wolf trots along a logging road at 2 a.m., covering ground efficiently on the packed surface. By dawn, when the first pickup trucks appear, the ...

Individual white storks incrementally straightened their migration routes to find more direct ways to move between destinations during the spring migration to summer breeding and nesting grounds, ...