Life on Earth started out microscopically small, but it didn’t stay that way for long. Here are five of the biggest creatures to have ever called planet Earth home.
Leatherback sea turtles are the biggest sea turtle species, which can weigh over 1 ton, but they are also one of the most threatened.
What are some animals that give birth to huge numbers of offspring at once?” (Watch a female sea urchin produce millions of eggs.) The mola, or ocean sunfish, looks like an animal cracker someone bit ...