Young gharials feed on insects, tadpoles, small fish and frogs. Aquatic invertebrates that feed on toad tadpoles include dragonfly larvae, diving beetles and water boatmen. This grebe dives to catch crustaceans, molluscs, tadpoles, and small frogs and fish. Some species are carnivorous at the tadpole stage, eating insects, smaller tadpoles and fish. Mink inhabiting the prairie sloughs primarily target frogs, tadpoles, and mice. Some species are carnivorous at the tadpole stage, eating insects, smaller tadpoles, and fish. Hatchlings are almost entirely carnivorous, feeding on insects, spiders, crustaceans, tadpoles, fish, and carrion. He and his friends traipsed through the woods looking for frogs, tadpoles, and minnows. The larvae resemble miniature illithid heads or four-tentacled tadpoles. They retained aquatic, fry-like tadpoles, a system still seen in modern amphibians. Apparent microgastroliths have also been found in frog tadpoles. Tadpoles excrete ammonia but shift to urea production during metamorphosis. The toxins present in cane toad tadpoles are concentrated in the skin. Glyphosate-based formulations can cause oxidative stress in bullfrog tadpoles. Paul Collier has an idea for a new pregnancy service involving toads and tadpoles.