An online resource based on the award-winning nature guide

Geese

Canada Geese Switch Diet to Berries & Grains

12-4-14  Canada geese2 IMG_5615During migration and throughout the winter, Canada Geese are highly gregarious, often gathering and feeding in flocks that consist of over a thousand geese. Almost exclusively herbivorous, they are efficient grazers, having serrations on their stout, flat bills. During summer they feed primarily on grasses and sedges. Considered a nuisance by many people with large lawns Canada Geese are attracted to these lawns not only because they can digest grass, but also because they have an unobstructed view that allows them to detect approaching predators. During and following migration, berries (especially blueberries) and agricultural grains including sorghum, corn and winter wheat make up most of their diet. When you see them in cornfields, they are feeding on fallen kernels as well as corn still on dry cobs — they are very good at removing the kernels.

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Canada Geese Migrating

9-25-13  migrating C. geese2 224This is the time of year when the honking of migrating Canada Geese can be heard as the familiar V-shape formation passes overhead. Many of these birds have a long, arduous migration and they need to conserve as much energy as possible. The V-formation that they fly in enables them to do so, in that it greatly boosts the efficiency and range of flying birds. Geese flying in a V-formation have slower heart beats than geese flying solo, and they can achieve a distance of 71% greater than single birds. The birds in front make this possible by enduring the most air resistance and, at the same time, improving the aerodynamics of the birds behind them by reducing the drag by up to 65 percent. The geese are constantly rotating positions in order to share “flight fatigue.”

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Waterfowl Vulnerable When Molting

8-23-13 canada goose remains 043All North American birds replace their old, worn plumage with new feathers at least once a year, a process known as molting. Most birds have what is called a “sequential molt,” in which their flight feathers are lost one at a time (from each wing). This allows many birds to continue flying while molting. However, during their annual molt, waterfowl undergo a “simultaneous wing molt,” losing all of their primary wing feathers at once, preventing them from being able to fly for a month or more while their new primaries are growing in. During this period, they are extremely vulnerable, as this photograph testifies to. If you look closely at the remains of the Canada Goose’s wing on the right in the photograph (dark feathers), you’ll see that the new primaries have almost, but not quite, grown out of their sheaths, making them not yet functional. It’s apparent that this bird was unable to take flight during its molt in order to escape its predator.

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