Giant Kangaroos

Giant Kangaroos, Procoptodon goliah, as large as 500 lbs once lived in Australia during the Pleistocene epoch as recently as 20,000 to 40,000 years ago before going extinct, possibly due to human influence.

Giant Australian Marsupial Diprotodon

The Giant Australian Marsupial, Diprotodon, looked like and sometimes referred to as a giant Wombat and lived from 1,600,000 to 40,000 years ago during the Pleistocene.  It was  the largest marsupial that ever lived, the size of a hippopotamus, 9 feet long and 6 feet high at the shoulders. It probably ate tree leaves, shrubs and grasses. 

Giant Ground Sloth

The Giant Ground Sloth, Megatherium americanum, was 18 feet long, as big as an elephant, and lived in South America during the Pleistocene until just a few thousand years ago.  Other species from the size of a cat to that of the the giant ground sloth lived from the Arctic to  Antarctica.  They were hunted by humans and some believe humans may even have farmed them. 

Phororhacos

These extinct 9 ft Tall, 280 lb flightless, carnivorous "Terror Birds" lived In Patagonia during the Pleistocene era. Phororhacos longissimus, one of the largest carnivorous birds to have ever to have lived, had claws like meat hooks and a massive hooked beak for ripping flesh from its prey while holding them down with sharp talons.

Iguanodons

One of the first dinosaur fossils to be discovered and one of the most popular. Iguanodons lived in North America, Europe and Asia from the late Jurassic Period to the late Cretaceous Period between 140 and 110 million years ago. They grew as large as 40 feet long and weighed up to 4 tons. Iguanodons were herbivores. They had bony beaks, toothless in the front to nip off plants and teeth for chewing similar to sloths. They had fingers! Scientists call them "digits". Iguanadon laid eggs and probably cared for their young.

This dinosaur ran on two legs. Bipedal dinosaurs (motivating on two legs), is not a recent theory. This sketch of an Iguanodon was published in 1921. However, Iguanodons became more quadrupedal as they became older and heavier, so this illustration may be inaccurate in that respect. The Iguanodon thumb spike was originally thought to belong on the animal's snout, similar to a rhinoceros. It was likely used to break seeds and other foods and as a weapon against predators like Tyrannosaurus Rex, or Megalosaurus.

Mastodonsaurus giganteus

Mastodonsaurus giganteus was an amphibian from the Middle Triassic that lived in Europe from about 245 to 228 million years ago. It was one of three species in the genus Mastodonsaurus.

M. giganteus could grow up to 20 feet long and its huge head was 4 feet long. Two upward pointing tusks prodruded through holes in the top of M. giganteus's snout. It was mostly aquatic and may have been unable to leave water as large numbers of fossil remains have been discovered together in what may have been pools which dried during droughts.

It lived in swamps and ate fish, which have been found in its fossil remains. Other amphibians' fossil remains have been discovered with tooth marks which may have come from Mastodonsaurus.

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