Garter snake hibernaculum at Pixley dam near Cokeville Meadows NWR, Wyo., (left) and a small-mouthed salamander (right). A cross section of wood showing carpenter bee tunnels and bee bread ...

The fossilized snake, thought to have lived some 38 million ... The snakes were fossilized nestled together within something called a hibernaculum, a small space where animals cluster inside ...