Home in a hollow
© Annmarie Young Photography/Moment/Getty Images
An adorable pair of baby gray squirrels squeeze from their hidey-hole high in a tree to say hi to the camera. Squirrel pups live a high-rise lifestyle from the start, usually nesting about 20 feet above the forest floor. While many squirrels build large, raggedy stick nests, others save the assembly step by simply finding a hollowed-out spot in a tree—whether bored by a woodpecker or naturally formed like this one.