Talk:Prehistoric Creatures/@comment-2600:6C4A:427F:FF09:C9E8:A246:A00C:F555-20170805055116/@comment-68.43.163.195-20170815212854

If possible refrain from spawning the following: dodo, terror birds, pteranadon mosasaurus, liopleurodon, ichthyosaurus, and henodus.

The reasons are because of they way the breed or their eating habit. Most on the list breed by dropping an item that has to be manually placed, and so you would need to continuously place them everytime they breed or they might die out. The eating habits for the Pteranadon and henodus require you to feed them manually, which means in an open ecosystem they would die out if left to fend for themselves.