For me the creepiest thing about ancient critters was the first emergence of shelled animals. The shells mean that there were other critters swimming around eating up all the non-shelled animals, but there isn’t any trace remaining of these early predators so we have no idea at all about what they looked like.
For me the creepiest thing about ancient critters was the first emergence of shelled animals. The shells mean that there were other critters swimming around eating up all the non-shelled animals, but there isn’t any trace remaining of these early predators so we have no idea at all about what they looked like.