A giraffe takes everyone in the park by surprise when he starts singing, instead of staying silent like all the other giraffes. Meanwhile, our heroes, following the clues left by the POP, head off in search of a deaf animal who may be in danger. But they end up discovering that the mission is actually to help a mute animal, that very same singing giraffe, who had been fooling everyone with a cicada hidden on his neck.
Dr Green has a little mishap and gets hurt, so Marina offers to take care of some things around the Park for him. She divides the tasks up among the gang but starts to get a bit bossy. Meanwhile, Zeek uses a little too much fertilizer on the vegetables and they grow to incredibly enormous sizes, destroying the hydroponic garden. When what's happened is discovered, Marina apologizes to everyone and they all pitch in to rebuild the greenhouse.