Madras Crocodile Bank, 6km south down the ECR from Kovalam, is a fascinating peek into the reptile world, and an incredible conservation and research trust. Founded by croc/snake-man Romulus Whitaker, the Bank has thousands of reptiles, including 18 of the world's 23 species of crocodilian (crocodiles and similar creatures), and does crucial work in maintaining genetic reserves of these animals, several of which are endangered.