Marvin is a very sensible and empathetic animal, he often flushes and even cries. Sometimes tears of joy but sometimes tears of sadness. He can always tell how people are feeling.
Books with crocodiles: Lyle Lyle Crocodile, Crocodiles Needs Kisses Too, The Crocodile Who Did Not Like Water
Fun Facts about crocodiles: crocodiles were around before the dinosaurs; and while they might not be as big as a T-Rex, they have lasted a lot longer.