"Lying" in the pigeon.
Two pigeons were taught to use symbols to communicate information about hidden colors to each other. When reporting red was more generously reinforced than reporting yellow or green, both birds passed through a period in which they "lied" by reporting another color as red.
D000818:Animals; D003118:Color Perception; D010856:Columbidae; D003142:Communication; D003216:Conditioning, Operant; D008192:Deception; D004193:Discrimination Learning; D005260:Female; D006801:Humans; D008297:Male