Quick Answer
Eiders prefer rocky coastlines over sandy beaches due to the abundance of food and suitable nesting sites provided by the rugged terrain. This preference is driven by the need for sheltered areas to escape harsh weather conditions. Rocky coastlines offer better protection against strong winds and waves.
Habitat Requirements
Eiders are a type of sea duck that thrives in the harsh marine environment. They require a specific combination of habitat features to survive, including access to rocky coastlines, tidal zones, and shallow waters. These areas provide an abundance of food sources such as mussels, clams, and snails, which are essential for their survival.
Food Availability
Rocky coastlines are ideal for eiders because they offer an extensive range of food sources. The crevices and cracks in the rocks provide a habitat for a variety of marine species, including mussels, which are a primary food source for eiders. In fact, a single mussel can provide up to 30% of an eider’s daily caloric intake. The rocky terrain also offers a diverse range of other food sources, including crabs, shrimp, and various types of seaweed.
Nesting and Breeding
Eiders require suitable nesting sites to breed and raise their young. Rocky coastlines provide the necessary shelter and protection from harsh weather conditions, allowing eiders to nest safely. The steep cliffs and rocky outcrops also provide a secure location for eiders to hide their nests from potential predators. In some areas, eiders have been known to nest in large colonies, with numbers reaching up to 1,000 individuals.
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