Mediterranean Gull Vs Black-Headed Gull: Key Differences Explained

Mediterranean Gulls and Black-Headed Gulls stand out among gull species due to their unique traits and behaviours. 

Strong social bonds are typical for Mediterranean Gulls, especially during the breeding season, whereas Black-Headed Gulls are known for their adaptability in various habitats.

In this article, we will look at the main differences between these two gulls, such as their nesting behaviours, foraging techniques, communication styles, and ecological roles. Continue reading to learn more.

Key Takeaways

• Before migration, Black-Headed Gulls often gain weight to create fat reserves, reflecting their ability to adapt to seasonal changes.
• When it comes to nesting, Mediterranean Gulls typically prefer large reed beds or marshy areas.
• Black-Headed Gulls undergo significant seasonal transformations, with their heads changing from chocolate-brown in the summer to speckled white during winter.
• Mediterranean Gull eggs are creamy-olive with dark brown markings, providing excellent camouflage in their habitat.
• Black-Headed Gulls are known for their loud “kree-ar” calls, which are vital for communication within their colonies.

What Is The Difference Between A Mediterranean Gull And A Black-Headed Gull?

Let’s look at the key differences between these gulls, including their behaviour, habitats, and breeding patterns.

Visual Differences

Mediterranean Gulls show a striking look during the breeding season, marked by their completely black heads and bright white eye rings. Their vivid red-orange beaks and legs enhance their visual appeal, alongside pale grey wings that contrast with their white bellies, flanks, upper backs, and breasts. 

Males and females appear nearly identical, making it hard to tell them apart by plumage alone. Outside of the breeding season, their feathers change to mostly white, with less distinct dark streaks around their eyes.

In the UK, Black-Headed Gulls are medium-sized birds known for their noticeable seasonal changes. Their heads are a rich chocolate-brown during the breeding season, while their underparts show a soft pink influenced by their diet. The dark slate-grey wings, sharp yellow bill, and bright red legs create a visually appealing image. 

In winter, their head feathers lighten to white and are speckled with black, demonstrating an interesting seasonal change. Like Mediterranean Gulls, male and female Black-Headed Gulls display the same plumage, adjusting their head colour from chocolate-brown in summer to speckled white in winter.

Differences In Habitat

Black-headed Gulls are highly adaptable, thriving in a variety of habitats including lakes, rivers, coastal areas, wetlands, and urban spaces. Their foraging skills allow them to make the most of different food sources, from fish to insects, which helps them spread widely. 

During the breeding season, these gulls prefer to nest in colonies, often choosing marshes, islands, and reed beds. Their ability to forage in shallow waters further highlights their ecological adaptability, as they catch small fish, insects, and invertebrates from the surface.

Similarly, the Mediterranean Gull occupies a range of habitats, favouring inland lakes, estuaries, coastal regions, and reservoirs. This gull species is equally at home in urban and suburban environments, as well as marshes, grasslands, and agricultural areas. 

When breeding, they typically choose large reed beds or marshy regions, often sharing these habitats with colonies of other birds, including Black-headed Gulls. 

In winter, Mediterranean Gulls typically move to inland areas such as farmlands, sewage works, and landfills, drawn by plentiful food sources. 

Initially centred around the Black Sea and eastern Mediterranean, this species has expanded its range significantly. It regularly breeds and winters across much of Europe, including the UK and Ireland, and can be found in northwestern Europe and northwestern Africa during colder months.

Nests & Eggs

Nests of Mediterranean Gulls are built quickly, usually within 2 to 4 days, with both male and female birds involved in gathering materials like twigs, grasses, and seaweed to create a shallow cup-like structure. 

The breeding season runs from late April to early June, peaking in May, when they typically lay 2 to 3 eggs. The eggs, creamy-olive with dark brown markings, measure around 54 mm by 38 mm, providing excellent camouflage against predators. 

Incubation lasts for about 23 to 26 days. These chicks, precocial from birth, open their eyes immediately and are covered in downy feathers, helping them adapt quickly to their environment. They fledge within 35 to 40 days.

Meanwhile, Black-headed Gulls take a bit longer to build their nests, which can take 3 to 7 days. Both sexes collect grasses and reeds to form a simple, shallow scrape lined with softer materials. Typically built on the ground within dense colonies, these nests offer crucial protection from predators. 

Eggs are laid from late March to June, with clutch sizes ranging from 2 to 3 eggs, occasionally reaching up to 4. Olive to buff in colour, the eggs feature dark brown spots, blending seamlessly into their surroundings for added camouflage. 

They hatch in 22 to 26 days, with a coordinated timing to minimise sibling competition. Like Mediterranean Gulls, Black-headed Gull chicks are precocial, hatching with open eyes and down feathers. 

They usually fledge around 35 to 40 days after hatching. After fledging, they continue relying on their parents for food while developing their foraging skills and gradually becoming independent.

Bird Calls

The call of the Black-Headed Gull stands out as an important part of its behaviour, often likened to a loud “kree-ar” sound that can be reminiscent of laughter. 

This unique vocalisation acts as a social signal within the gulls, playing a crucial role in keeping order among the busy colonies where they breed. The sound is vital for communication within the flock, helping in the establishment of social hierarchies and navigating the complex interactions found in their crowded environments.

Mediterranean Gulls are generally less vocal. However, when they do call, it tends to be a distinctive whining “ee-ar” or “yee-ah” cry, characterised by its rising and falling pitch. 

This sound, while less vibrant than that of the Black-Headed Gull, plays an important role in the Mediterranean Gull’s communication, although in a more subtle manner compared to the lively interactions found in Black-Headed Gull colonies.

Size & Weight

The Mediterranean Gull weighs between 230 and 280 grams, placing it among the smaller and lighter gulls, yet its sturdy build enables it to thrive in different coastal and inland settings. 

Measuring between 36 and 38 cm in body length, this medium-sized gull boasts a wingspan that typically ranges from 92 to 100 cm, making it somewhat larger and more robust than the often-seen Black-headed Gull.

In comparison, the Black-headed Gull shows a wider weight range, typically from 200 to 400 grams. These birds often increase in weight before migration to build fat reserves, allowing them to manage seasonal shifts and prepare for lengthy migratory journeys. 

Slightly smaller in body length, ranging from 33 to 37 cm, Black-headed Gulls have a larger wingspan of 100 to 110 cm. Their long, pointed wings enhance agility in flight, which is essential for foraging, evading predators, and adjusting to various habitats.

SEE ALSO: Mediterranean Gull Life Cycle: Nest Building To Fledging (and everything in between)

Frequently Asked Questions