Lions and Tigers and Bears

We spent our last day in the National Zoo with Mary and the little boy she nannies. His name is Peter. Can you spot the Croc?

Peter found a friend in the zoo!
Her name is Gracie. Aren't they cute?
What is that?

These spiders weren't even caged! The zookeeper said they'll never leave their webs because they are blind and the zoo feeds them, so they have no reason to wander. But I counted them, and there was one missing...