Serial learning in the pigeon.
Three pigeons learned to peck four colors in a particular sequence, regardless of how these colors were positioned on four response keys and without feedback following each response. This demonstrates that serial learning is possible in subprimate animals.
D000818:Animals; D003118:Color Perception; D010856:Columbidae; D004193:Discrimination Learning; D005794:Generalization, Response; D012691:Serial Learning