These large and powerful insects are as adept at swimming as they are at flying. Eaten as a delicacy and found in Thai and Chinese markets, these insects bear the nickname toe-biters and are capable of inflicting a painful stab with their sharpened front beak. These bugs feed on other aquatic insects, tadpoles and even small fish, injecting them with a powerful toxin and digestive juice that allows the bug to such up the contents at will. They are also known for their snorkel-like breathing tubes at the end of their abdomen.