[Buzzardo]

In my friend's campaign, I had a character who had the Create Animal spell. He was not a druid, but the situation is parallel.

Neither of us wanted the character to be able to summon just anything, him because of campaign balance and me because I wanted to keep the list manageable. So the rule we used was that I had to study each animal before I could add it to my list. A week of full-time study would do. For exotic creatures, I had to encounter them in person.

It was limiting in a useful way without eating up points.