Get up close with the playful and agile world of squirrels in this charming wildlife footage. Watch as they scurry up trees, leap between branches, and nibble on acorns with remarkable dexterity. This ...

But it’s not that simple, as the research of our colleagues and our own work on various primates has shown.

Have you ever seen a squirrel without a tail? It looks a bit like a rat. Where his tail should have been was a small red nub.

At Cornell, Dawn Chen was counting sperm stored in a pair of organs called spermathecae in female fruit flies, fully ...