Recently, I found these Animal Cards in the $1 Dollar Bin at Target. I thought they'd be perfect to use with Little Bears' Schleich plastic animals we have collected over the last year (also from Target).
At this point, we use the cards to make it a matching game. He lays out the cards and then finds the coordinating animals to go with them. He knows most of the animal names.
Eventually, we hope to use the cards and animals to teach him animal facts and the correct animal names (such as "African Elephant" or "Asian Elephant" rather than just "Elephant"). After that, we plan to find a large continent map in order to teach Little Bear where the animals live.