The heaviest animal in the world is the blue whale, which can weigh as much as 150 to 200 tons and can measure 100 feet from head to tail. Females usually weigh more than males. At birth, blue whale calves are about 25 f... More » Pets & Animals Dinosaurs

As of 2015, the heaviest whitetail deer that has been recorded had a field weight of 402 pounds. It is estimated that this animal had a live weight of 511 pounds. More »

The kakapo, a large flightless bird, enjoys the distinction of the most popular animal in the world, according to Wildscreen Arkive. The kakapo, also called the owl parrot, lives only in New Zealand. It holds many record... More »

Apatosaurus, the correct name for what is also known as Brontosaurus, was approximately 20 feet shorter and 32 tons lighter than Brachiosaurus. Apatosaurus stood 30 to 35 feet tall and 65 to 75 feet long, weighing 18 ton... More »

Even though there was a popular theory that Stegosaurus may have had two brains, one in its head and one toward its tail or rear end, that idea has largely been discredited in paleontology. Some paleontologists may still... More »

The Brachiosaurus most likely defended itself by simply smashing predators with its tail or feet because it had no other way to defend itself. Because the Brachiosaurus was so large, however, it is likely that predators ... More »

The Megalodon was the biggest shark ever to prowl the world's oceans, with some estimates putting the size of the ancient predator at more than 50 feet long. Some scientists believe that the largest of this particular an... More » Pets & Animals Dinosaurs