A good question! Frogs are amphibians. This means they can’t regulate their own body temperatures and start life as water-dwelling creatures. As they mature, they grow legs and lungs to live on land.

A tree frog became a viral social media star on Oct. 5. What did it do to achieve such fame? It looked really, really big in a video and devoured a banana. The video has been viewed at least 8 million ...