In the grand tapestry of Earth’s history, there once roamed colossal creatures that towered over the landscapes. These magnificent animals, now lost to time, were the giants of the land. From ...

A first-of-its-kind aerial survey of wildlife in South Sudan has helped confirm the world’s largest land mammal migration, and now we’ve even recorded evidence of it. The survey focused on the ...

The Titanoboa—the largest known snake to ever exist—was as long as a school bus, growing to an estimated 50 feet long and 3 feet wide.

Discovery sheds new light on largest known animals on Earth. Whales, dolphins and porpoises belong to a group called cetaceans, which includes the largest known animals that ever lived, the two ...

From the largest known sauropods ever discovered, including Argentinosaurus, Patagotitan and Futalognkosaurus, whose weight exceeded 60 tons (54.4 metric tons) and were bigger than a semitruck, to ...

In this corner, weighing up to 190 metric tons, is the blue whale. This behemoth still swimming in Earth’s oceans is the current titleholder for the heaviest animal to ever exist — living or ...

The world’s oldest mammal has been identified using fossil dental records ... A shrew-like creature that lived 225 million years ago is the oldest mammal ever identified ...

The world's oldest mammal has been identified using fossil dental records -- predating the previously confirmed earliest mammal by about 20 million years -- in a new discovery hailed as "very ...

The most massive animal to have ever lived is still swimming around today. The blue whale, Balaenoptera musculus , regularly tips the scales at over 100 tonnes. Some estimates have pegged ...

Until now, the Morganucodon had been considered the first mammal, with isolated teeth showing that it dated back around 205 million years. The Morganucodon had a small gerbil-like body and a long ...

By Lianne Kolirin, CNN The world’s oldest mammal has been identified using fossil dental records — predating the previously confirmed earliest mammal by about 20 million years — in a new ...