on Drepanididae, [562] n.;

on Houbara, [262] n.

Roy, on Flight, [61] n.

Royal Birds, [136]

Rubigula, [505]

Ruc, [43]

Ruff, [234], [270], [285]

Rump, [20]

Rupicola, [479], [480];

dances of, [482];