The untamed wilderness of prehistoric North America was a realm where terrifying prehistoric creatures reigned supreme ... enough to wander too close to the water. With a bite force rivaling ...

Prehistoric animals roamed all over the Earth ... meant that Titanoboa would have grabbed its prey and taken it to the water where it would have been strangled. It is not known how long ...

The animals constantly grew new shell material ... which scientists believe helped provide buoyancy and move ammonites through the water. It’s unclear whether ammonites were very efficient ...

or maybe retain the original Ice/Water-type features of the original Walrein. Fan-made past Paradox forms for creatures that resemble prehistoric animals are not uncommon in the Pokemon community.