Have the children pick an animal (2) off the board and place them in the ark.  Each animal represents a song to sing and a way to sing.  Here are some ideas for these animals and some others:

Monkey:  Sway arms above head
Elephant:  Sway arm like a trunk in front of your nose
Pig: Scrunch nose up
Frog:  Hop
Alligator: Arms straight out and put palms together like a alligator chomp
Owl:  Make glasses around eyes with your hands
Penguin:  Waddle
Zebra:  Gallop