Chickadees are plump, sparrow-sized birds with tiny beaks. Mountain chickadees are a bit larger and stockier than the black-capped chickadee. Both species have a black cap and throat with a white ...

Chickadees replace 30 percent of their old neurons to make room for new memories in their hippocampus. The expansion of the hippocampus is one of the most impressive aspects of any bird. Seasonal ...