Fauna
Insect

Chionea valga

Chionea valga

Also known as Snow Fly, Wingless Snow Fly

Wingless and spider-like in appearance, these bizarre crane flies emerge during midwinter to walk deliberately across deep snowdrifts. Their bodily fluids contain glycerol and sugars that serve as natural antifreeze, preventing ice crystallization at temperatures well below freezing. Adults navigate subzero forest floors solely to find mates before retreating back beneath the snowpack into the insulated leaf litter.

FlightlessWinter ActiveCold Hardy
Chionea valga reference1 / 3
(c) Jimmy Dee, some rights reserved (CC BY-SA) · cc-by-sa
—observations
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Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & preyDecaying leaves, Subnivean fungal hyphae, Soil microbes
Predators
  • Black-capped Chickadee
  • Winter Wren
  • Deer Mouse
ThreatsLoss of persistent winter snowpack and climate warming
HabitatsBoreal and temperate forests with deep winter snowpack and leaf litter
Life span1–2 years (adults live a few weeks in winter)
Classification
  1. FamilyLimoniidae
  2. SpeciesChionea valga
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Safe to observe at a normal distance.
Responsible observation
  • Spotting on Snow: Look for small, slow-moving spider-like specks on clean snow surfaces on mild, overcast winter afternoons.
  • Gentle Observation: Avoid breathing directly on them or holding them in warm hands, as sudden heat can quickly prove fatal.
Related species
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