First super predator ever lived on earth

       Anomalocaris, means "abnormal shrimp" is an arthropod- like sea monster that lived in North America during Cambrian period. Anomalocaris got it's name because it  was believed to be multiple animals; it's front appendages were believed to be the hinder halves of shrimp ("strange" because their "head" was always missing), it's mouth was believed a jellyfish, and it's body a sea cucumber or a sponge. This mistake was only realized in the 1980s, providing the modern reconstruction as the meter-long flippered  monster. Anomalocaris' eyes, on the caliber of only a few modern insects, were compound with around 30 thousand lenses. He would swim above the ocean floor, find prey, and shred it in three rings of teeth.

Primitive whale

 Ambulocetus means " Walking whale" is a bizarre prehistoric cetacean that lives in Pakistan, Asia during Eocene period. It's the reason how whales can swim underwater since this otter like crocodile creatures adapt in water. Because of it's legs, the ambulocetus swim like an otter and used it for lunging prey above the water since it's a carnivore. Ambulocetus is a very important transitional fossil as it displays the link between terrestrial mammals and the early whales.‭ ‬Ambulocetus acquired its name‭ ‬from the idea that it could‭ ‬both‭ ‬swim by undulating its back as well as leave the water and walk on land. However a 2016 study by Ando & Fujiwara suggests that Ambulocetus was more aquatic than terrestrial, perhaps even exclusively aquatic.