Zookeeper: an independent-play game for pre-schoolers

A game with no reading or counting, let pre-schoolers play together. Draw a card and put it face up in front of you. On your next turn, draw a new card or bank those face-up cards. Draw an open cage card and return any un-banked cards to the discard pile. Play until you are out of cards. The person with the largest pile of banked cards wins.