
Tree Swallows (Tachycineta bicolor)
Photo: Keith Williams, HBW/Rex
Tree Swallows huddle through a spring snowstorm in Canada’s Yukon Territory during their southward migration.
(via: National Geo)

dendroica: Chestnut-sided Warbler (Dendroica pensyvanica)
(photo by polarlow on Flickr)

The Arctic Tern (Sterna paradisaea)
A small, slender white bird, the Arctic Tern is well known for its long yearly migration. Its travel from its Arctic breeding grounds to its wintering grounds off of Antarctica may cover perhaps 40,000 km (25,000 mi), and is the farthest yearly journey of any bird… (read more: Cornell Lab of Ornithology)
(photo: Toivo Toivanen & Tiina Toppila)