Roger Federer and Elmo from Sesame Street seem to disagree on the letters of the alphabet in a Super Bowl ad for ON running shoes.

Discover the declining numbers of Blanchard's cricket frogs in Wisconsin. Learn about their habitat and conservation status.

Elmo has been around a long, long time, and he's one of the few characters that all of the generations that have come forth ...

A king cobra's love quest leads to an unexpected meal, while a tree frog battles a dangerous beetle for survival. For more ...