Common Green Bottle Blowfly, Lucilia sericata, blowing a bubble. (© Muhammad Naaim / Shutterstock)

Normally dark, the compound eyes of a robber fly (family Asilidae) are beautifully reflective when light strikes them. (© Seema Swami / shutterstock)

Stalk-eyed fly, Diasemopsis sp. (Thomas Shahan / Flickr CC BY 2.0)

Golden-backed Snipe Fly, Chrysopilus thoracicus, a predator, found in wooded areas of the eastern US. Adults alleged to be predatory. (Katja Schulz/FlicKr; CC BY 2.0)

Mosquito larvae in water. About 100 eggs at a time are laid on the surface of water. (© Ajintai / Shutterstock)

Fly internal anatomy. (Daktaridudu / Wiki; CC-BY-SA 4.0.jpg

Anatomy of the House Fly. I: head; II: thorax III: abdomen. — 1: prescutum 2: anterior spiracle 3: scutum 4: basicosta 5: calypters 6: scutellum 7: wing vein 8: wing 9: abdominal segment 10: haltere 11: posterior spiracle 12: femur 13: tibia 14: spur 15: tarsus 16: propleuron 17: prosternum 18: mesopleuron 19: mesosternum 20: metapleuron 21: metasternum 22: compound eye 23: arista 24: antenna 25: maxilary palps 26: labium 27: labellum 28: pseudotracheae 29: tip. Fiestoforo Wiki; CC BY 4.0)

Picture-winged Flies, Chetostoma curvinerve, are fruit flies and among the relative few species have a noticeable wing pattern. (gailhampshire / Flickr; CC BY 2.0)

Female Picture-winged Fly, Pseudotephritis approximata, depositing eggs in rotting wood. (Katja Schulz / Flickr: cc by 2.0)

Robber fly (Asilidae sp.). A formidable predator, notice its large compound eyes, and needle-like proboscis used to stab a prey and inject a neurotoxin to subdue it. © guraydere / Shutterstock)