Any type or maturity of Desert Locust adults that do not form a group or
concentration. Adult locusts differ more in form than in colour. The solitary phase has
shorter wings, longer legs, and a narrower pronotum, or dorsal sclerite (with higher
crest and larger head), than the gregarious phase. The adult of the gregarious phase has
a more saddle-shaped pronotum, broader shoulders, and longer wings.
Once able to fly, solitarious adults migrate at night when the temperature is above 20–22°C and the wind is less than 7 m/s (13.6 knots). They usually take off about 2 -3 hours after sunset and can fly for up to 10 hours, usually flying for only a few hours at a time. Individuals have been detected by radar up to heights of 1 800 m.