Baby squirrel in the park

I found this baby squirrel in centennial park in holland michigan. It's a baby squirrel, i csn run faster then it because it's a baby.

my pet catapiller

This is a catapiller that i found in my yard. It's very small. I put it into a jar with leaves to eat and a stick to climb and a damp rag to keep him moist. It's yellow with a black spot and kind of green. I would like to find out what kind it is.