Pp. 332- Keyserling 334) that, while all the other birds provided with perfect song-muscles had the " planta " or hind part of the and " tarsus " covered with two long and undivided horny plates, the larks (q.v.) had this part divided by many transverse sutures, so as to be scutellated behind as well as in front; just as is the case in many of the passerines which have not the singingapparatus, and also in the hoopoe.
Its appearance is sufficiently striking - the head and lower parts, except a pectoral band, white, the former adorned with an erectile crest, the upper parts dark grey banded with black, the wings dusky, and the tail barred; but the huge bill and powerful scutellated legs most of all impress the beholder.
Its bill is shorter than its head; its tarsi are reticulated instead of scutellated in front, with the upper part feathered instead of being bare; and the plumage of its body and wings is very different, each feather being tipped with a distinct whitish band, while that of the head and neck is greyishbrown.