Many crocodiles vocalize to communicate. ... For example, Siamese crocodiles and caimans emit a loud hiss when threatened, and hatchlings of most species make sounds described as grunts or quacks. In addition, members of both sexes may produce a loud roar during the breeding season.

Are lions scared of crocodiles?

"Lions are wary of crocodiles and will generally avoid the water to stay away from crocs," writes NatGeo TV. "Occasionally, crocodiles have been known to attack lions while they drink at the water's edge (but lions are also known for attacking and eating baby crocodiles)."

Which animal kills crocodiles?

Crocodiles have many different predators, such as big cats like jaguars or leopards, and big serpents like anacondas and pythons. Other predators of crocs include hippos and elephants. Baby crocodiles are especially vulnerable to predators, and they're hunted by herons, egrets, and eagles, and even wild pigs.