In 2011, a gray whale was recorded covering 14,000 miles from Russia to Mexico and back, establishing the record for longest migration by any mammal. The previous record holder was the 11,000-mile migration that a humpback whale recorded earlier the same year.
The Arctic Tern earns the No. 1 spot for longest migration of any animal, covering a staggering 44,000 miles in its zig-zagging migratory route each year from Greenland to Antarctica and back again.
The longest shark migration ever recorded was 6,900 miles over 99 days in 2003 by a great white shark traveling from South Africa to Australia.
Source:
http://www.cnn.com/2015/02/24/world/gallery/worlds-longest-animal-migrations/
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