Crocodilian embryos lack sex chromosomes, and sex is not determined genetically, unlike in humans. Temperature influences sex in them. The up and down temperature influences the sex of alligators and caimans. The temperature is low during winter and colder at the depth of the water, while the upper surface of the water has a high temperature because sunlight cannot reach depth.Males are produced at low temperatures, whereas females are produced at high temperatures. Males exceed females at intermediate temperatures, although both sexes are created in that zone.