Are any of these animals still around today? Complex life has existed on earth for just over half a billion years, and in all that time the planet has seen some terrifying, weird, and incredible ...

Whale sharks are the largest species of shark. Their gentle manner and massive size make them the gentle giants of the ocean. However, one especially large whale shark has been spotted off the Pacific ...

Q. You wrote that blue whales are the largest mammals. What are the largest and smallest animals of other groups? What ecological problems do animals confront by being extremely big or extremely small ...