Gavia stellata is the smallest, slightest of the divers. It stands at 53-69 cm., and its wingspan ranges from 106-116 cm. During the breeding season, the upper body is a solid dark brown. The head and upper neck is grayish, with a large, glossy colored patch on the foreneck. It is white underneath and the tail is dark. In the winter, the face and foreneck are pure white, and the upper part is dark brownish and finely spotted with white. Males average slightly larger than females, and have a heavier head and bill. Its neck is thick, and the nostrils are narrow and elongated, as an adaptation to diving. The iris is reddish, especially in adults during the breeding season. The body is designed for swimming, with short, strong legs set far back on the body. The legs are perfect for moving through water, although this design makes walking on land difficult. The three front toes are webbed, and these loons have short, well-defined tails. They can vary their buoyancy in order to remain underwater, with the whole body submerged and only the eyes and bill visible above the surface. Adult loons shed their flight feathers simultaneously at the end of the breeding season and are thus unable to fly for several weeks. The body feathers are molted only in early spring and early autumn.
Though loons are generally extremely awkward on land, red-throated loons have been known to travel long distances on land. When seriously disturbed, they may even move to a new pool with their chicks. It is the lightest and most agile species of the genus and it has the largest wing-beat amplitude, and only the red-throated loon can take off from the ground, or alight directly on it. After breeding, these loons move to coastal waters, and sometimes gather in large flocks in particularly rich feeding areas. At such localities, the birds roost and feed communally. Aggressive behavior may be observed here, but it doesn’t develop. They spend long hours caring for their plumage, and their elaborate bathing practices involve rigorous wing shaking, rolling, diving and somersaulting. Roosting takes place mainly on water, but can occasionally occur on land during the breeding season. The loon’s characteristic call is extremely loud and can be heard far away. It is used to proclaim the occupation of a territory. It sounds like a long, low-pitched whistle with some very clear notes interspersed. It is made by both mates at once. When disturbed or threatened, the red-throated loon produces a raven-like croaking call of warning. It also uses a short, frequently repeated, gooselike cackle, which it gives when flying over its own or neighboring territory. Red-throated loons have a variety of ritualized behaviors, including a series of stereotyped swimming ceremonies, which are performed by both partners.

Red-throated Loonis a widespread breeder across much of northern Europe, which accounts for less than a quarter of its global breeding range. Its European breeding population is relatively small (92,000 pairs), and underwent a large decline between 1970-1990, notably in Russia and Fennoscandia. Although the species was stable overall during 1990-2000, with stable trends in most countries within its European range, its population has clearly not yet recovered to the level that preceded its decline.
This diver has a widespread breeding distribution in northern Eurasia and North America. The breeding population of the European Union, entirely restricted to the British Isles and Denmark, amounts to 1400 breeding pairs and seems to be increasing

It breeds mostly on fresh water, typically in fairly open moorland, and may occupy stretches of water of almost any size. It is often found to be nesting by small pools. It winters on inshore waters along sheltered coasts, occasionally inland.

Red-throated loons breed on freshwater lakes of the subarctic and boreal zones, with a strong preference for undisturbed sites. They readily settle on stretches of still water ranging in size from small pools to large, deep lakes, and sometimes even nest on sheltered coasts.
Loons are monogamous, forming long-term pair bonds. Pairs established from the previous season probably remain together throughout the winter, and start nesting early on after a minimal amount of display. Even newly formed pairs have simple courtship displays. Copulation takes place on dry land and is repeated frequently. It may begin on their day of arrival at the nest and continue until all eggs have been laid. The male selects the nest site.
Since loons have difficulty in walking, the site is always close to water. The nest is simply a heap of plant matter. Several pairs may build nests semi-colonially, especially when there are few tracts of suitable water within reach of their feeding areas. Thus they are tolerant of other pairs close by and only defend the area immediately surrounding the nest. However, if they are not breeding colonially, they may aggressively defend up to several hectares, including several non-nesting ponds.
Breeding starts in May in the south of the range, and in the north, timing depends on when spring thaw occurs. 1-3 eggs may be laid, but there are almost always 2. Incubation is 27 days and is performed by both partners, with the female spending more time on the nest than the male. Incubation starts when the first egg is laid. The resulting differences in age and size of the chicks means that when food is scarce, the older, larger chick gets more, and the youngest frequently starves to death within its first few days.  The chicks have dark brown down, and are paler below. By 2-3 weeks, they spend most of the time swimming, though they still rely on their parents for food until they are fully grown. Fledgling takes place at around 7 weeks. They are sexually mature at 2-3 years, and are known to have lived 23 years in the wild.  Nest failures due to predation are probably much more important than those due to human disturbance, because their range in North America, at least, does not overlap much with where humans live.

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