| Their eye-brows seemed pursed up and contracted, the pupils were of a light rose-colour, the irides of a very pale cast of blue. |
| The black stared, with the opalescent whites of his eyes forming rings around his irides. |
| Both pupils and irides were black, and glistened like the eyes of a weasel. |
| The bill is one inch one line long from the gape, and, with the irides, is red. |
| The irides of the eyes of this bird were of a beautiful bright yellow colour. |
| Male and female birds are very similar, with the hens distinguished only by their brighter, pinkish-red irides. |
