I used this ppt for 1st and 2nd grade. (I took out some of the harder vocab ie: nocturnal, carnivore, etc for 1st graders). For the activity I gave student teams pictures of animals. When I called out a characteristic, such as "furry" or "has hooves" the first team to raise an animal card that matched the description got its card taken. The team to run out of cards first, wins.