Little Gull vs Black-legged Kittiwake

In short

The Little Gull (Hydrocoloeus minutus) and the Black-legged Kittiwake (Rissa tridactyla) are two distinct seabirds that can be differentiated by their size, plumage, habitat preferences, and vocalizations. The Little Gull is significantly smaller, features a more delicate structure with distinctive black wing tips, and prefers freshwater or brackish habitats, while the Black-legged Kittiwake is larger, has a robust body, and is commonly found nesting on cliffs along marine coasts.

Identification tips

1. Birds of the World Similar-Species Diagnostics:
2. "Little Gull is the smallest gull species and can be recognized by its dark wing tips and black head in breeding plumage."

3. "Black-legged Kittiwake is larger with a distinctive black leg and a black 'w' pattern on the wings, primarily nesting on cliffs."

4. AI Field Diagnostics:

5. Size and Structure: Look for the size difference; the Little Gull is significantly smaller than the Black-legged Kittiwake. If you see a small, delicate gull with a black cap, it’s likely a Little Gull.
6. Plumage Patterns: The black wing tips of the Little Gull are a key feature, while the Kittiwake has a more uniform gray and white appearance with the black "w" pattern in the wings. The Little Gull’s slender body contrasts with the Kittiwake’s stocky frame.
7. Habitat Cues: If you are near coastal cliffs or marine environments, you are likely observing Black-legged Kittiwakes. If you are near lakes or marshes, look for Little Gulls.
8. Behavioral Observations: The Little Gull’s flight pattern is much more erratic and tern-like, while the Kittiwake will soar and glide more gracefully. Also, pay attention to their feeding behavior; Little Gulls often hover before diving, while Kittiwakes dive directly into the water from a height.
9. Vocalization: Listen for their calls; if you hear a loud, repetitive "kitt-i-wake," you are likely near Black-legged Kittiwakes, while the Little Gull’s call will be softer and more high-pitched.

By focusing on these distinct characteristics, birdwatchers can effectively identify and differentiate between the Little Gull and Black-legged Kittiwake in the field.

Size

• Little Gull: The smallest gull species, measuring approximately 28-32 cm in length with a wingspan of about 70-75 cm. It has a lightweight, slender body and a short bill.
• Black-legged Kittiwake: Larger, measuring around 40-46 cm in length with a wingspan of 100-110 cm. It has a stocky body and longer wings compared to the Little Gull.

Plumage

• Little Gull: Breeding adults have a black head with a white body and gray wings that have black tips. The underparts are white, and they exhibit a distinct black "M" pattern on the wings during flight. In non-breeding plumage, they have a more mottled look with a pale grayish head.
• Black-legged Kittiwake: Characterized by a white body with a light gray back and wings. They have a black "w" pattern on the wings and a distinctive black leg, with a black line running from the eye to the bill. Their head is white with a slight black marking behind the eye, especially during the breeding season.

Behaviour

• Little Gull: Often seen foraging in small groups, it tends to hover over water before diving for small fish and invertebrates. Its flight is agile and fluttering, reminiscent of terns.
• Black-legged Kittiwake: Known for their more robust and soaring flight style, they are often observed nesting on cliffs in large colonies. They primarily feed on fish, foraging by diving and surface-picking.

Habitat

• Little Gull: Prefers freshwater and brackish habitats such as lakes, marshes, and wetlands, particularly during breeding. In North America, they are often found in the Great Lakes region.
• Black-legged Kittiwake: Typically found in marine environments, they nest on steep cliffs along coastlines and are more associated with oceanic conditions. Their breeding colonies are often located in high, inaccessible areas.

Voice

• Little Gull: Produces a high-pitched, thin call that can be described as a "kik-kik" sound, especially when agitated or during displays.
• Black-legged Kittiwake: Has a distinctive, harsh call that sounds like "kitt-i-wake," which is quite loud and can be heard over long distances, especially in nesting colonies.