Remains pulled from the La Brea Tar Pits revealed deformed vertebrae and rare tumors, possible signs of inbreeding among now-extinct saber-toothed cats.

Adult finches make "heat calls" as the temperature rises. Exposure to the song prepares their unhatched young's brains for the heat.

During courtship, male scissor-tailed nightjars crack their wings together to make a sharp snapping sound. It's the result of colliding arm bones.

Hours of diving videos and hundreds of survey responses reveal the common diver mistakes that can cause irreversible reef damage.