Mother Nature doesn't always play by the rules... Sometimes she flips the script, hits Caps Lock and produces something so unusually large that it looks like it could be cast in a sci-fi movie. We're ...

This mysterious Japanese artist, who goes by the pseudonym of Ariduka55 or Monokubo on social media channels, creates otherworldly beautiful drawings that breathe life into a completely new fantasy ...

A new study shows how the extinction of giant animals 10,000 years ago reshaped food webs, with lasting impacts on ecosystems.

Some animals are memorable because of their size. Others because of how dangerous or rare they are. But then there are a few ...

The giant squid was detected along with over 220 species, including some that might have never been discovered before.

Giant panda cub Xiao Qi Ji experiences snow for the first time just beyond his indoor exhibit on Sunday. Though he did not venture further, his parents Mei Xiang and Tian Tian played around outside.

Size shapes the way animals move, hunt, and survive. For example, in the ocean, ginormous creatures rely on their massive bodies to travel long distances or ambush prey. On land, there are large ...

Some octopuses that lived over 72 million years ago were as long as whales. These huge predators may have been the largest invertebrates ever.

Ancient sloths lived in trees, on mountains, in deserts, in boreal forests and on open savannas. Some grew as large as elephants. Illustration by Diego Barletta The largest sloth of all time was the ...

The largest-ever flying animal acted like a giant heron, plucking prey from the water and launching itself into the air. Quetzalcoatlus northropi was a pterosaur which ruled the skies for millions of ...

Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. (CNN)More than 12,000 ...