CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY
Larva of a great diving beetle (Dytiscus marginalis) resting at the water surface. It breathes through a tube at its posterior, which is open to the surface. Like the adult, the larva is a voracious predator, a habit that has earned it the common name water tiger . While the adult is an active hunter, the larva rests perfectly still and waits for prey to pass, before grabbing it in its large jaws. It takes a wide range of prey, including insects, tadpoles and small fish.
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