SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Breathing holes (spiracles) at the posterior end of a blue bottle fly (Calliphora vomitaria) larva. They open into the tracheae, which are involved with respiration and actively transport air and oxygen around the larva's body. The grill-like slits stop dust and foreign objects getting stuck in the spiracles.
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