Irruptions of Sand-Grouse, [322], [324], [325]

Ischium, [9], [9]

Island Hen, [244]

Ispidina, [386];

I. madagascariensis, [386]

Ithagenes, [198], [200], [217];

buries itself in snow, [218];

I. cruentus, [217];

I. geoffroyi, [218];

I. sinensis, [218]