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CBO
Arctic Terns make the longest migration of all the Arctic bird species. In fact, they have the longest migration ever recorded—an incredible 59,650 miles, which is more than double the circumference of the Earth. Each summer, they travel from Antarctica to the Arctic to breed, then they migrate back to Antarctica to overwinter. An annual pole-to-pole journey, which is very impressive! Often called “sea swallows”, due to their shape and long tail streamers, Arctic Terns are stunning little birds, with white and light-grey plumage, a black ‘cap’ on the head, and bright red beaks and feet. They are one of our favourite Arctic birds to see and photograph during the summer months.
https://expeditionsonline.com/blog/birds-arctic
https://expeditionsonline.com/blog/birds-arctic