Bot Fly vs Twin-lobed Deer Fly

Side-by-side species comparison

Attribute Bot Fly Twin-lobed Deer Fly
Scientific Name Dermatobia hominis Chrysops relictus
Order Diptera Diptera
Family Oestridae Tabanidae
Size 12-18 mm 9-12 mm
Habitat Forests Wetlands
Diet Parasites Blood Feeders
Regions Central America, South America Europe, Northern Asia
Conservation Least Concern Least Concern

Bot Fly

Parasitic fly whose larvae develop under the skin of mammals including humans. Female captures a mosquito and glues eggs to it — when the mosquito bites, body heat triggers egg hatching.

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Did You Know?

The human bot fly is so devious it hijacks mosquitoes — it catches them, glues eggs to their bodies, then the eggs hatch when the mosquito lands on warm skin.

Twin-lobed Deer Fly

A golden-green eyed deer fly with distinctive dark wing markings. It breeds in peaty wetlands and bogs across northern regions.

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Did You Know?

It is one of the most common biting flies encountered in northern European bogs.