Ox-pecker, [561]

Oxylabes, [503]

Oxynotus, [526]

Oxypelia, [326];

O. cyanopis, [340]

Oxypogon guerini, [436] f.

Oxyrhamphidae, [469], [477]

Oxyrhamphus, [477]

Oxyurus, [484]

Oyster-catcher, [276], [302];