Image: Brimstone Butterflies Twisting Wings in Courtship Flight

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Description: Pair of Brimstone Butterflies, head-on, in rapid courtship flight. The male (below) is yellower, and is twisting his wings vigorously (increasing the angle of attack) to add lift. Hot, bright, humid summer's day among fen vegetation, Tourbieres de Vendoire, Charente, France.
Title: Brimstone Butterflies Twisting Wings in Courtship Flight
Credit: Own work
Author: Chiswick Chap
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes

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