Horse Fly vs Secondary Screwworm Fly

Side-by-side species comparison

Attribute Horse Fly Secondary Screwworm Fly
Scientific Name Tabanus bovinus Cochliomyia macellaria
Order Diptera Diptera
Family Tabanidae Calliphoridae
Size 20-25 mm 8-12 mm
Habitat Wetlands Farmland
Diet Blood Feeders Carrion Feeders
Regions Europe, Asia North America, South America
Conservation Least Concern Least Concern

Horse Fly

A large, stout fly with huge iridescent compound eyes that display rainbow patterns. Only females bite, using scissor-like mouthparts to slash skin and lap up blood.

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Did You Know?

Horse fly eyes display stunning iridescent bands of color created by structural interference patterns, and scientists have used their anti-reflective eye structure to design better solar panels.

Secondary Screwworm Fly

A blow fly that breeds in carrion and occasionally infests wounds in livestock. It is widely used in forensic studies in the Americas.

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Did You Know?

Unlike the primary screwworm, it only feeds on dead tissue rather than living flesh.