What animal migrates the longest distances?

http://news.nationalgeographic.com/news/2006/08/060808-bird-migration.html

hmmmm i would have guess gray whales, but google told me its the bird jp pointed out.

Gray whales are however the mammal that migrates the longest distance, some 12k miles a year.

http://www.timesonline.co.uk/tol/news/world/article602848.ece
http://www.sciencedaily.com/releases/2007/04/070410091423.htm
http://news.nationalgeographic.com/news/2006/08/060808-bird-migration.html

Humans

Humans have traveled over 235,000 miles to the moon. Does that count?

I cannot find the reference on the Web, but I saw a fascinating story on the news recently about a female sea turtle who had traveled more than 2,500 miles to feed. Anyone have a link to that?

While humans have wanderlust and curiosity, I don’t really think it is the same as the migration imperative that is instinctive within animals. Although lurve to you, tyrantxseries, for the quip!

Arctic Tern? Migrates between the polar regions clocking up a life time milage greater than the distance to the moon and back.