No, animal is a third declension.
I don't see anything that makes it look like a 2nd. What makes you think that? It's a third declension neuter.
EDIT: Wait, is it because you say the -a? All neuters have -a in the Nom and Acc plural. That means you cannot tell it's declension from that form alone. However, once you've seen enough of them, you'll start to get the feeling for the declension.