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Snakes are carnivorous reptiles. The skeleton of most snakes consists solely of the skull with a solid and complete braincase. The skin of a snake is covered in scales. Moulting occurs periodically throughout a snake's life. Snakes use smell to track their prey. Cobras and vipers use venom to immobilize or kill their prey. All snakes are strictly carnivorous, eating small animals including lizards, other snakes, small mammals, birds, eggs, fish, snails or insects. In some cultures snakes are a delicacy, prized for the alleged pharmaceutical effect of being beneficial for the heart.