Before the Party
Cut out photos of different animals from nature magazines (real photos, not cartoon drawings) and glue them down one side of a large poster board. On 3x5" cards, write descriptions about each animal.
At the Party:
Hang the poster board on one wall of the party area and lay out the 3x5" cards on a table. When the activity starts, have your guests pick up the cards and work together on figuring out which descriptions go to which animals. When they think they have it figured out, have them place the description next to the animal using a push-pin or tape.
Check their work and if they have two descriptions wrong, tell them 'Two are wrong" and let them work at it again. Don't tell them which two - see if they can work together to figure it out. Once all descriptions are correctly matched to the animals, hand out a small prize to each guest.
Examples: