Human: What are the main characteristics of the crocodile? Assistant: 
The main characteristics of a crocodile include its scaly skin, powerful jaws and sharp teeth. It has a long body with a pointed snout, webbed feet, and a long tail that can help it swim quickly. Crocodiles have a unique way of breathing called 'branchial respiration' which involves taking air through their gills. They also have a strong sense of smell and hearing, and can move at speeds up to 25 mph (40 km/h).