Reindeer Warble Fly vs Rain Fly

Side-by-side species comparison

Attribute Reindeer Warble Fly Rain Fly
Scientific Name Hypoderma tarandi Haematopota crassicornis
Order Diptera Diptera
Family Oestridae Tabanidae
Size 13-17 mm 9-12 mm
Habitat Heathland Rivers & Streams
Diet Omnivores Blood Feeders
Regions Scandinavia, Finland, northern Russia, Siberia, Arctic Canada, Alaska Europe, Central Asia
Conservation Least Concern Least Concern

Reindeer Warble Fly

A stout, furry fly that parasitizes reindeer and caribou. Females dart at reindeer to lay eggs on their legs. Larvae burrow through the skin and migrate through the body, creating warble lumps under the back skin.

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Did You Know?

The buzzing of this fly causes reindeer to panic and stampede, and heavy infestations can reduce a reindeer's body weight by up to 25 percent.

Rain Fly

A medium-sized cleg with mottled grey wings and iridescent green eyes. It is most active in humid overcast weather before thunderstorms.

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Did You Know?

Its activity increases dramatically before rainstorms, hence the common name 'rain fly'.