Grey-headed Gull

Identification

The grey-headed gull is a small gull measuring 42 cm in length, slightly larger than the black-headed gull. Summer adults are distinctive, with a pale grey head, grey body (slightly darker in tone than black-headed gulls), and striking red bill and legs. The wings display black tips to the primary feathers with conspicuous white "mirrors" that are particularly noticeable in flight. The underwing is dark grey with black wingtips, and the wings are notably broader than those of black-headed gulls. In winter plumage, the grey hood disappears entirely, leaving only two dark smudges around and behind the eye.

Immature birds take two years to reach full maturity and can be identified by a black terminal tail band and more extensive dark areas in the wings. Adults have a distinctive white iris, while immature birds have dark eyes. The sexes are similar in appearance. This is a notably vocal species, especially at breeding colonies, with a raucous, crow-like caw call that makes audio identification straightforward.

Range & Habitat

The grey-headed gull breeds patchily across South America and Africa south of the Sahara, with two recognized subspecies: the slightly larger and paler South American population and the smaller African population. The species is not truly migratory but is dispersive, becoming more widespread during winter months. Rare vagrants have been recorded in the United States, Italy, and Spain, indicating occasional long-distance wandering beyond its normal range.

This gull is predominantly coastal or estuarine in habit, though it is not a pelagic species and is rarely seen far from land at sea. It breeds in large colonies in reedbeds and marshes, where nests may be placed on the ground or floating. Outside the breeding season, it is highly gregarious, with flocks numbering hundreds or thousands forming when feeding conditions are favorable.

Behaviour & Diet

The grey-headed gull is locally abundant within its range and notably social. Breeding birds nest in large colonies where they are particularly noisy, with their distinctive raucous calls frequently heard. Each pair typically lays two or three eggs per breeding attempt. Like most gulls, the species is highly gregarious outside the breeding season, both when feeding and during evening roosts.

Large flocks congregate in response to favorable feeding conditions, demonstrating the opportunistic feeding behavior typical of gulls. Although predominantly coastal and estuarine, the species shows a preference for shallow waters and inland wetlands rather than open ocean environments.

Best Time & Places to See It

Winter months offer the best opportunity to observe grey-headed gulls, as populations become more dispersed and widespread during this season, increasing your chances of encountering them. Their preference for coastal and estuarine habitats makes these the ideal locations to search, particularly in areas with reedbeds and marshes where breeding colonies form.

Look for large flocks gathering in suitable feeding areas, as the species' gregarious nature means that finding one gull often leads to discovering hundreds or thousands nearby. Evening roosts provide excellent opportunities for observation, as birds concentrate in these traditional gathering spots.

Photography Tips

The bold red bill and legs provide striking color contrasts that photograph well, particularly in bright tropical or subtropical light. During summer months, the pale grey head and distinctive white mirrors on the primary feathers create excellent compositional elements. Capture birds in flight to showcase the broader wing profile and the contrast between dark underwings and white mirrors.

For maximum impact, photograph breeding colonies where the species' abundance and vocal behavior create dynamic scenes. Winter plumage, with its subtle dark eye smudges, requires careful exposure to render detail. The species' gregarious nature allows for impressive flock photography; use these opportunities to capture the scale of their social behavior and create layered compositions with multiple birds at different distances.