Black Throated Diver Behavior Diet and Conservation Status

The Black-throated Diver is a fascinating bird species, and understanding its behavior, diet, and conservation status is essential to appreciate its unique characteristics.

They are social birds that often form large colonies during breeding season, with some colonies consisting of up to 100 pairs.

These birds are known to be monogamous, with pairs forming during breeding season and remaining together for several years.

In terms of their diet, Black-throated Divers are carnivorous, feeding on a variety of aquatic animals including fish, crustaceans, and insects.

Their diet consists mainly of small fish, which they catch while diving to depths of up to 12 meters in search of food.

They are also known to feed on aquatic insects, such as dragonflies and damselflies.

Unfortunately, the Black-throated Diver is listed as Near Threatened on the IUCN Red List, due to a decline in population size and range.

Their population size has been declining due to habitat loss and degradation, as well as pollution and climate change.

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Black-throated Divers are the least common of the three Diver species regularly wintering around Ireland's coastline. They tend to be less gregarious, often seen alone or in small groups of two to three birds.

In Ireland, you're likely to spot them in winter plumage, where the bold black and white patterns of the upper body and black throat are absent. The dark and isolated white patch on their rearmost flanks is a distinctive feature.

Their dagger-shaped bill is carried in a near-horizontal position, and their upper body plumage is darker than that of other diver species, giving the impression of a low body position in the water.

Black-throated Divers are the least common of the three Diver species regularly wintering around Ireland's coastline.

They tend to be less gregarious, with single birds or small groups of two to three birds usually observed.

In Ireland, this species will usually be seen in winter plumage when the bold black and white patterns of the upper body and black throat are absent.

In winter plumage, at least half the neck is dark and, on the water, birds have a distinctive isolated white patch on their rearmost flanks.

Look for a dagger-shaped bill carried in a near-horizontal position and upper body plumage that is darker than that of the other diver species, which gives the impression of a low body position in the water.

Compared to Red-throated Divers, Black-throated Divers have a longer, slightly bulkier body with a more prominent chest and a broader, heavier head and thicker neck.

The bill is slimmer than that of Great Northern Divers.

Gavia Arctica, also known as the Barnacle Goose's wintering ground, is home to a unique waterbird species.

This bird, also known as the White-fronted Goose, is a medium-sized goose with a distinctive white forehead and a black neck.

They have a black head, neck, and breast, with a white forehead, and a brownish-gray back and wings.

Their wings are relatively long and narrow, allowing for efficient flight.

They have a distinctive call that sounds like a low, honking "hroon" or "hroo".

Black-throated divers breed in various locations, including Scotland, Scandinavia, and parts of North America, but there are no confirmed breeding records from Ireland.

They typically breed in the spring, with the exact timing depending on the temperature locally, and usually return to their breeding grounds in March or April.

The male and female take part in building the nest, which they construct from plant material gathered from around the site, and it takes them just 2 or 3 days to complete.

Their nests are not elaborate but are functional, providing just enough structure to support the eggs and keep them from rolling into the water.

Black-throated divers typically lay 1 to 3 eggs, with a typical clutch containing 2 eggs, and the female does the bulk of the incubating, which lasts around 27 to 29 days.

The eggs are oval shaped and brown-green coloured with darker speckles, and each egg is around 84 x 52 mm in size and weighs around 122 grams with 9% of that weight being the shell.

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The female will lay eggs in the spring, with the exact time depending on the temperature locally, and the eggs are incubated by both parents for around 27 to 29 days.

Black-throated divers are solitary nesters and lay 1-3 olive-brown eggs with dark brown spots, which are incubated by both parents for 28-30 days.

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Black-throated divers can be found in a variety of habitats, including small pools and lochs in the Outer Hebrides and north west Scotland.

During the breeding season, they prefer lochs with small islets where they can build their nests.

In the winter, they migrate to coastal waters all around the UK, often spotted in sheltered bays and beaches, as well as large lakes and reservoirs.

A Black-Throated Diver's habitat is quite unique. During the breeding season, they inhabit small pools and lochs in the Outer Hebrides and north west Scotland.

They prefer lochs with small islets where they can build their nests. These islets are crucial for their breeding success.

In the winter, Black-Throated Divers migrate to coastal waters all around the UK. They can be spotted in sheltered bays and beaches, as well as on large lakes and reservoirs.

Black-throated divers are solitary hunters, most often searching for food alone, but some small groups do gather during winter to feed together.

They can be found on the sea around most coasts during the winter, feeding on fish.

In the far north of Scotland, they nest on small pools and lochs.

Black-throated divers also sometimes nest or overwinter on big lakes and reservoirs.

The Black-Throated Diver's lifespan is quite impressive, ranging from 12 to 20 years in the wild.

Pollution and oil slicks are major concerns for these birds, as they spend a lot of time at sea.

The survival rate of the Black-Throated Diver is closely linked to pollution and oil slicks.

In fact, the oldest reported Black-Throated Diver reached an impressive age of 28 years according to ring data.

Black-throated divers eat mainly fish, but they also occasionally snack on aquatic insects, crustaceans, and molluscs.

They tend to be secretive and elusive birds, especially during the breeding season, which means they're not typically aggressive.

However, if their nesting territory or chicks are threatened, they can display defensive behaviour, including warning calls, lunges, or splashing.

Black-Throated Diver eggs are oval shaped.

They are brown-green coloured with darker speckles.

Each egg is around 84 x 52 mm in size.

They weigh around 122 grams, with 9% of that weight being the weight of the shell.

Black-throated divers are primarily fish-eaters, but they also occasionally snack on aquatic insects, crustaceans, and molluscs.

Fish make up the bulk of their diet.

Black-throated divers are not generally aggressive birds, but they can show defensive behavior if their nesting territory or chicks are threatened.

They tend to be more secretive and elusive, especially during the breeding season, which means they're not likely to engage in direct aggression.

In fact, they're more likely to avoid conflict by diving underwater and swimming away rather than confronting intruders.

If they do become territorial and protective of their nests, they may display aggression toward intruders, but this usually takes the form of warning calls, lunges, or splashing.

Physical contact or fights are rare, and they're generally more inclined to defend themselves than to initiate an attack.

The Black-throated Diver is a protected species under the EU's Birds Directive, which aims to conserve and manage all wild bird species within the EU's territory.

Conservation efforts are crucial for the Black-throated Diver's survival, as its population has been declining due to habitat loss and degradation.

In the UK, the Black-throated Diver is a Red-listed species, indicating a high level of conservation concern.

The best time to spot a Black-throated Diver is during the breeding season, from April to July, when they can be found on freshwater lakes and rivers.

During this time, they are easily recognizable by their distinctive black throat patch and white cheek patches.

Black-throated Divers are most active during the early morning and late evening hours, making them easier to spot during these times.

In the UK, the best places to spot a Black-throated Diver are in the north and west of England, particularly in the Lake District and Cumbria.

The black-throated diver, also known as the Arctic loon in America, is a fascinating bird species. They can dive to depths of up to six metres in search of food.

One of their impressive abilities is fishing at such great depths. However, they typically only stay underwater for less than a minute.

In contrast to their impressive swimming skills, black-throated divers struggle to walk well on land due to their legs being too far back on their body.