Shortest bird migration

In stark contrast to the thousands of kilometres flown by certain migrating birds, such as the Arctic tern (Sterna paradisaea), the world's shortest migration is that of North America's blue grouse (Dendragapus obscurus). During the winter, it inhabits mountainous pine forests, then when nesting time begins in springtime it descends a mere 300 m to deciduous woodlands in order to feed upon the early crop of seeds and fresh leaves.