Most mammals don’t live past their reproductive years. Only a few that we know do, such as killer whales, pilot whales, and possibly some great apes and human beings.

Researchers have discovered goldfish as long as 12 inches and weighing as much as 4.2 pounds in Western Australia. They think it’s the result  of people releasing their goldfish into the water. This is because, in the wild, that’s how big they can grow.

The female Burmese python is able to incubate her eggs by raising her body temperature by as much as seven degrees warmer than the air temperature. They accomplish this by frequently hiccupping or having muscle spasms.

During the cold winters, the Alaskan wood frog becomes a frog-shaped block of ice. It literally stops breathing and its heart stops beating. Then, when Spring arrives, the frog thaws and returns to normal,and goes along its merry way.

The world’s most expensive aquarium fish is the Asian Arowana, also known as the dragon fish. It’s believed by the Chinese to bring good luck and prosperity due to its red color and coin-like scales. This fish has sold for up to $300,000.