The Himalayas were formed during the Cenozoic Era, but they are not a characteristic of the era as a whole.

Indricotherium was a giant rhinoceros-like mammal that lived in Central Asia during the Oligocene epoch. It is estimated to have weighed up to 20 tons and stood over 15 feet tall at the shoulder.

Argentavis magnificens was a giant bird that lived in South America during the Miocene epoch. It is estimated to have had a wingspan of up to 20 feet and weighed up to 150 pounds.

Argentinosaurus huinculensis was a giant sauropod dinosaur that lived in Argentina during the Cretaceous period. It is estimated to have been over 115 feet long and weighed over 100 tons.

Meganeura monyi was a giant dragonfly that lived during the Carboniferous period. It had a wingspan of over 2 feet and a body length of over 1 foot.

The blue whale is the largest mammal that ever lived. It can grow up to 100 feet long and weigh over 200 tons.

The ostrich is the largest bird that ever lived. It can grow up to 9 feet tall and weigh over 300 pounds.

The crocodile is the largest reptile that ever lived. It can grow up to 20 feet long and weigh over 2,000 pounds.

The giant stick insect is the largest insect that ever lived. It can grow up to 25 inches long.

The blue whale is the largest mammal that ever lived. It can grow up to 100 feet long and weigh over 200 tons.

The ostrich is the largest bird that ever lived. It can grow up to 9 feet tall and weigh over 300 pounds.

The crocodile is the largest reptile that ever lived. It can grow up to 20 feet long and weigh over 2,000 pounds.

The giant stick insect is the largest insect that ever lived. It can grow up to 25 inches long.

The blue whale is the largest mammal that ever lived. It can grow up to 100 feet long and weigh over 200 tons.

The ostrich is the largest bird that ever lived. It can grow up to 9 feet tall and weigh over 300 pounds.