Foot of a Cuckoo
The foot of a Cuckoo, a bird belonging to the Scansores order. Scansores is an order of birds, popularly known as climbing birds. The most important of the families are the cuckoos, the woodpeckers and wry-necks, the parrots, the toucans, the trogons, the barbets, and the plantain-eaters.
Logan Marshall, Ed. International Self-Pronouncing Reference Library (five vols.) (Philadelphia, PA: International Press, 1911)