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An ancient whale claimed the title of heaviest animal ever in 2023

Perucetus colossus lived 39 million years ago and weighed in at between 85 and 340 tonnes, meaning it was probably larger than even blue whales. The discovery has inspired both fan art and music
An artist’s impression of Perucetus colossus
Alberto Gennari

In August, the blue whale was cut down to size. Once known as the heaviest animal to have ever existed, that title has now been claimed by a gargantuan species of ancient whale discovered in Peru. The oversized beast, dubbed Perucetus colossus, has delighted people around the world.

The story of P. colossus began in 2010, when at the State Museum of Natural History Stuttgart in Germany and his colleagues unearthed the partial skeleton of an enormous whale in southern Peru. The team’s subsequent analysis of the bones, which are 39 million years old, have now revealed that the fossil belonged to a previously unknown species of whale.

The ancient whale was a hefty creature, weighing between 85 and 340 tonnes. The largest blue whale on record weighed 190 tonnes, which positions P. colossus as a leading contender for the heaviest animal to ever exist.

Amson and his team were surprised to find that the discovery captured people’s imaginations, leading to numerous depictions of the whale. “I think almost everyone, even people not really into science were intrigued,” he says. “On Spotify, there is even a song called Perucetus colossus.

The example above is a personal favourite of team member at the University of Pisa, Italy. “It reminds me of the algae that sometimes coats the backs of manatees,” he says.

Now, Amson and the team hope to go back to Peru to uncover more fossils and study the whale in more detail. “If we could find a specimen with a skull, that would be quite tremendous,” he says.

Topics: fossils / whales