Goosander Diet and Size: Feeding Habits, Predators, and Measurements
The Goosander (Mergus merganser) is a fascinating member of the sawbill family, known for its exceptional diving abilities and fish-catching prowess.
First recorded breeding in the UK in 1871, these elegant diving ducks have since established themselves as regular residents across British waterways, particularly in Scotland and northern England.
In this article, let’s learn more about their feeding habits, breeding behaviours, size, and conservation status, offering a comprehensive insight into their fascinating lives!
Table of Contents
The Dietary Habits Of The Goosander
Goosanders are skilled underwater hunters, equipped with specialised bills that make them highly efficient predators in aquatic environments.
What Does A Goosander Eat?
Goosanders are predominantly piscivorous, feeding mainly on fish ranging from small sticklebacks to larger salmon and trout. Their long, serrated bill is perfectly adapted for catching and holding slippery prey underwater.
These skilled hunters often dive in groups, using their excellent underwater vision to spot and catch fish. They can stay submerged for up to 30 seconds while hunting, making them formidable predators in both rivers and lakes.
During winter months, they may supplement their diet with aquatic insects, crustaceans, and molluscs, especially when fish are less abundant. This dietary flexibility helps them survive during challenging conditions.
What To Feed A Baby Goosander?
Baby Goosanders, known as ducklings, are precocial and can feed themselves shortly after hatching. Their diet initially consists of small aquatic insects and larvae, which are easier for them to catch and digest.
Parent birds guide their young to suitable feeding areas, teaching them to catch small fish as they grow. The ducklings gradually develop their fishing skills, starting with smaller prey before moving on to larger fish.
Breeding Habits Of Goosanders
These diving ducks have unique breeding behaviours that set them apart from many other waterfowl species.
Do Goosanders Mate For Life?
Goosanders do not mate for life but instead form new pair bonds each breeding season. They typically pair up during winter, with males performing elaborate courtship displays to attract females.
Once paired, the female selects a nesting site, usually a tree cavity near water, and lines it with down feathers from her breast. She lays between 8 to 12 eggs and incubates them alone for approximately 30 to 32 days while the male departs.
The Size & Weight Of Goosanders
These large diving ducks are impressive in both size and appearance, with notable differences between males and females.
How Much Does A Goosander Weigh?
Male Goosanders typically weigh between 1,300 to 2,100 grams, while females are lighter, weighing 900 to 1,700 grams. This sexual dimorphism is common among waterfowl species.
Their robust build helps them dive effectively and handle larger fish prey. The weight difference between males and females helps with their different roles during the breeding season.
How Big Is A Goosander?
Goosanders measure 58 to 66 centimetres in length, with an impressive wingspan of 82 to 97 centimetres. Males are generally larger than females, displaying more prominent features.
Their streamlined body shape enables efficient swimming and diving, while their powerful wings allow for quick takeoff from water surfaces despite their size.
Are Goosanders Under Threat?
In the UK, Goosanders are currently Green-listed in the Birds of Conservation Concern, indicating they are of least conservation concern.
Globally, they are classified as Least Concern on the IUCN Red List of Threatened Species.
What Eats A Goosander?
Adult Goosanders have few natural predators due to their size, but they may fall prey to foxes, mink, and large birds of prey.
Their eggs and ducklings are more vulnerable, facing threats from corvids, gulls, and various mammals.
Where Can I See Goosanders In The UK?
Goosanders can be found across much of the UK, particularly in Scotland and northern England. They frequent freshwater lakes, rivers, and reservoirs, especially in upland areas during the breeding season.
During winter, they may move to lowland waters and occasionally visit sheltered estuaries. Popular spots include the Lake District, Scottish Highlands, and various reservoirs across Wales and northern England.
The best time to observe these magnificent birds is during winter when they gather in larger numbers and are more visible on open water.
SEE ALSO: Goosander Life Cycle: Nest Building To Fledging (and everything in between)
Frequently Asked Questions
Male Goosanders have a glossy green head and a striking blood-red beak with a white body, while females have a gingery-orange head and grey body with a clear delineation between colours.
Goosanders typically live for 7 years in the wild, though some individuals may live longer under favourable conditions.
While not rare, Goosanders are less common than many other waterfowl species. They are more frequently seen in Scotland and northern England, particularly during winter months.
