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Loon

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Loons, also known as divers in British and Irish English, are specialized aquatic birds. They belong to the genus Gavia and the family Gaviidae. These birds are found throughout much of North America and northern Eurasia. They are roughly the size of large ducks or small geese. Loons are highly adapted for life in the water. This makes them incredible swimmers but quite clumsy on land.

The physical design of a loon is perfect for diving. Their toes are connected by webbing to push through the water. Unlike ducks or geese, a loon's belly stays submerged while it swims. They have spear-shaped bills used for hunting. To help with digestion, loons swallow small pebbles called gastroliths. These stones sit in the gizzard, which is a part of the stomach. The gastroliths help crush hard items like the exoskeletons of crustaceans or bones.

Gavia immer (Common Loon) 1APR2017
Gavia immer (Common Loon) 1APR2017

Loons have specific behaviors for survival and movement. Their feet are located far back on their bodies. This position provides great power for swimming and diving. However, it makes walking on land very difficult. Most species must run across the water's surface to take flight. They flap their wings and run upwind to create lift. Only the red-throated loon, or Gavia stellata, can take off from land.

Red-throated Loon (Gavia stellata) - Summer plumage breeding adult2
Red-throated Loon (Gavia stellata) - Summer plumage breeding adult2

Migration is a major part of the loon life cycle. In the winter, they move from northern freshwater lakes to southern marine coastlines. To survive in the ocean, they use special salt glands. These glands are located directly above their eyes. They filter salt out of the blood and flush it through the nasal passages. This allows them to drink saltwater and eat ocean fish. Some loons are capable of incredible journeys. Scientists using satellite transmitters recorded daily flights of up to 1,078 km.

PacificLoon24
PacificLoon24

The history of loon classification has been quite complex. In 1758, Carl Linnaeus used the name Colymbus for these birds. This caused much confusion among naturalists. Some used the name for loons, while others used it for grebes. The International Commission on Zoological Nomenclature eventually stepped in to help. In 1956, they suppressed the name Colymbus. They established Gavia as the valid genus name for loons. This settled long debates regarding the correct scientific names.

Gavia arctica EM1B1934 (48009481846)
Gavia arctica EM1B1934 (48009481846)

Reproduction for loons involves careful nesting in freshwater habitats. They often build nests on islands or in emergent vegetation. This helps protect their eggs from land predators. Both the male and female participate in building the nest and incubating eggs. The incubation period lasts for about 28 days. Most clutches consist of two eggs. Loon chicks are precocial, meaning they can swim and dive immediately. For the first two weeks, they often ride on their parents' backs to stay warm.

Yellow-billed Loon Chipp South 8-12-13 Ryan Askren
Yellow-billed Loon Chipp South 8-12-13 Ryan Askren

Loons are also part of a wider ecological system. They play a role in the food web by eating fish, amphibians, and snails. However, they face threats from human activities. For example, they can accidentally eat small lead pellets from fishing gear. This can lead to lead poisoning and death. Because of this, many places have banned lead shot. These jurisdictions include Canada, Great Britain, Denmark, and several U.S. states like Michigan and Vermont. Protecting their water is vital for their continued survival.

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🖼️ Images & Media (7)
Loons Swimming in Wood Lake BC on a...
File:Red-throated Loon (Gavia stellata) - Summer plumage breeding adult2.jpg
Red-throated Loon (Gavia stellata) -...
File:Gavia arctica EM1B1934 (48009481846).jpg
Gavia arctica EM1B1934 (48009481846).jpg
File:PacificLoon24.jpg
PacificLoon24.jpg
File:Gavia immer (Common Loon) 1APR2017.jpg
Gavia immer (Common Loon) 1APR2017.jpg
File:Yellow-billed Loon Chipp South 8-12-13 Ryan Askren.jpg
Yellow-billed Loon Chipp South 8-12-13...
File:Gavia fossil Vienna.jpg
Gavia fossil Vienna.jpg
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