Sally and Nick are trying to guess what they'll be when they grow up when the Cat drops in for a visit. Cat is sure Nick and Sally will never guess what his friend Puggle will be when she grows up. When they see her, they start guessing right away! A frog? A duck? No, a beaver! They discover that, while Puggle may have some similarities to other creatures, she will grow up to be a duck billed platypus!