Swallows and scorpionflies find symmetry is beautiful.
Ridley
M
M
D000818:Animals; D001717:Birds; D001824:Body Constitution; D003198:Computer Simulation; D004175:Diptera; D005145:Face / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D008297:Male; D009812:Odorants; D012726:Sexual Behavior, Animal; D013623:Tail / Q000033:anatomy & histology