Common Loon Watching | Lac Saint-Pierre Observation Site

The common loon

The Common Loon (Gavia immer)

The common loon is a large aquatic bird specializing in diving, renowned for its underwater hunting prowess and melancholic songs. It is an important indicator of the quality of lake ecosystems.

Sexual dimorphism

The Common Loon exhibits weak sexual dimorphism:

Males and Females: Both sexes have similar plumage, with slight variations in color intensity during the breeding season.

Size and wingspan

Size: Common Loons generally measure between 70 and 90 cm in length.
Wingspan: Its wingspan is around 140 to 160 cm, which allows it to benefit from excellent lift during its gliding flights.
Weight: Weight varies between 3 and 4.5 kg, with some differences between sexes.

Beak and legs

Beak: Its robust, slightly curved beak is perfectly adapted to the rapid capture of fish, constituting an essential tool for its dives.
Legs: The legs, located towards the rear of the body and heavily webbed, provide efficient propulsion when swimming and diving, although their position reduces its ability to move on land.

Social behavior

The Common Loon generally adopts solitary behavior when hunting, favoring stealth to approach its prey.
During the breeding season, it actively defends its territory and performs impressive courtship displays to attract a partner.

Voice

Its characteristic vocalizations, sometimes described as plaintive cries or mournful songs, play an important role in communication between partners and the demarcation of territories.

Breeding Habitat

Deep Lakes and Large Ponds: During the breeding season, the Common Loon frequents deep bodies of water with clear water, essential for locating and capturing its prey.
Areas with Aquatic Vegetation: Banks with dense vegetation provide protected nesting sites and natural camouflage.

migration habitat

Ponds and Reservoirs: During the migratory period, it uses various inland water bodies as stopovers for feeding and resting.
Transition Zones: Environments alternating between calm waters and moderate currents facilitate transit between breeding and wintering areas.

wintering habitat

Areas with Unfrozen Waters: In winter, the Common Loon migrates to areas where the water remains ice-free, thus ensuring access to its food resources.
Lakes and Coastal Areas: Some individuals also frequent coastal habitats where fresh and salt water mix, creating rich and diverse ecosystems.

habitat features

Water Depth and Clarity: Deep, clear water is essential for spotting prey and performing effective dives.
Abundant Aquatic Vegetation: The presence of dense vegetation at the water’s edge provides secure nesting sites and refuge from predators.
Water Quality: Well-oxygenated, low-pollution water conditions promote diverse aquatic wildlife, a source of food.

Adaptation to the Habitat

Its large wingspan and gliding abilities allow it to cover vast territories in search of food.
Its webbed hind feet and robust beak are perfectly adapted for catching fish during rapid and precise dives.
These characteristics make the Common Loon a valuable indicator of the health of lake and aquatic ecosystems.

The birds of Lake St. Pierre