The evolution of early whales has been described as explosively fast. As one evolutionist explained this week:
We could have found that the main whale lineages over time each experimented with being large, small and medium-sized and that all the dietary forms appeared throughout their evolution, or that whales started out medium-sized and the largest and smallest ones appeared more recently—but the data show none of that. Instead, we find that the differences today were apparent very early on.
It is remarkable how evolution has produced such amazing creatures.