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These birds spend years traveling the ocean alone, yet they return to the same spot every year to meet their specific partner. Their "reunion" dances are highly choreographed and unique to each couple.

: Often considered the poster birds for eternal love, swans develop lasting relationships and use a famous "neck-heart" pose as part of their bonding. Albatrosses xhamster sex animal videos hot

Stephenie Meyer’s Twilight saga is often mocked, but its success is scientifically understandable. The central relationship—between Bella (a human) and Edward (a vampire)—is a literal translation of large predator stalking prey. These birds spend years traveling the ocean alone,