An eye-opening fossil

[Buddy]

That is the current speculation based on the fossils found.

In First Life, Attenborough also compares anomalocaris to the mantis shrimp, an organism living today. It hunts relatively small pray compared to its size and is an ambush predator, relying on superior strength, speed and senses to overpower the unsuspecting fish.

Not personally totally convinced by the argument given the spines on the inside of the limbs. But without a fossil where the prey is obvious speculation is the best we can do.

It's times like this that science needs to get off of its lazy butt and figure out a way to make a time machine.

[Pharaoh Cat]

Cthulhu!