The Shedao Island Pit Viper 

• Location: They are endemic to Shedao Island (literally meaning "Snake Island") located in the Bohai Strait off the coast of northeastern China, which feeds into the northwestern Pacific Ocean. 
• Hunting Strategy: Because the small, isolated island lacks native ground mammals, these vipers have evolved an extreme sedentary lifestyle. They sit perfectly camouflaged on tree branches or rocks for months, waiting to ambush migrating songbirds (mostly passerines) that use the island as a critical rest stop during the spring and autumn migration seasons. 
• Adaptation: Because their food source is only available a few weeks out of the year, these snakes have evolved to hunt heavily during migration peaks and spend up to eight months of the year in a state of hibernation or aestivation (dormancy) to conserve energy. [5]