I'll start at A and give you the name of a prehistoric animal that starts with A. Then you tell me the name of a prehistoric animal that starts with B, and the next person comes up with one that starts with C, and so on. When we reach Z, we start over at A. You can't use more than two letters in one post, and if you repeat a word that was used before, someone else gets to use that letter again.

A- Acrocanthosaurus