gaivota-do-índico vs gaivota-d'olho-branco

The Brown-headed Gull and White-eyed Gull can be distinguished by their head markings and eye color. The Brown-headed Gull has a brown head during the breeding season, while the White-eyed Gull has a distinctive white eye-ring. These features are most reliable when observed closely.

Look for the brown head of the Brown-headed Gull during the breeding season and compare it to the White-eyed Gull's white eye-ring. In non-breeding plumage, focus on the presence of the white eye-ring in the White-eyed Gull.

The Brown-headed Gull has a brown head during the breeding season, which contrasts with the White-eyed Gull's dark head and prominent white eye-ring. Outside the breeding season, the Brown-headed Gull's head is white with a dark ear spot, while the White-eyed Gull retains its white eye-ring.