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Mountain Chickadee

Mountain Chickadees incubate their eggs almost a full week longer than their near-twins, the Black-capped Chickadees do. Some scientists think this is an evolutionary change that’s been made possible by Mountain Chickadees’ tendency to nest inside harder-walled trees, which are safer from predators.

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Uploaded on June 4, 2015
Taken on May 30, 2015