鸽巢原理 pigeonhole principle

原鸽 [鸟] Rock Dove ; [鸟] rock pigeon ; Columba livia ; pigeon

小笠原杂色林鸽 Bonin wood pigeon ; versicolor ; Columba versicolor

鸽笼原理 pigeonhole principle

鸽舍原理 Pigeonhole Principle

鸽籠原理 pigeonhole principle

鸟]原鸽 rock dove

鸽衣原体病 Chlamydiosis lnfectious ; Dove chlamydiosis

小笠原林鸽 bonin wood pigeon