One of the largest animals to exist after dinosaurs went extinct was the Titanoboa.

Blue whales weigh up to 300,000 pounds and are about 75 to 79 feet long.

The Megalodon weighed over 100,000 pounds and was up to 50 feet long.

The Pelagornis sandersi is considered the largest flying bird species and had a wingspan of about 20 to 24 ft (6.1 to 7.4 m).

The Megalania Prisca is an extinct lizard that weighed 700-4,200 pounds and was 15 to 23 feet long.

Epicyon was a large genus of canines estimated to have a full body length of 7.9 feet (2.4 meters) and a total body weight of 370 pounds.

The Simbakubwa Kutokaafrika could have weighed anywhere from 620 to 3,330 pounds!

Forest wolf spiders can measure up to 50 millimeters long from tip to tip.