From ancient times, man has been fascinated by crocodiles; Egyptians named a city after them and promoted the species to a divine category. Cifuentes and Cupul also admire crocodiles and they have devoted themselves to their study. There is no single breed in the world omitted from this work. Among their multiple discoveries it is worth mentioning the fact that this reptile is not a threat: when it attacks, it only does so to defend themselves or to protect their territory or their offspring.