Invite birds to your yardAs you might imagine,
migration takes a toll on the birds. It is not uncommon for birds to lose one-fourth to one-half of their body weight as they migrate thousands of miles. Before the journey north to their breeding grounds birds accumulate fat to help maintain their energy reserves. Sometimes, however, reserves are not enough. That’s where you can help by creating “stopover sites” in your yard with plenty of food, water and shelter.
At this time of year the numbers and variety of birds appearing in your yard can actually change every morning as many small songbirds migrate through the night. Species such as warblers, vireos, orioles, grosbeaks, tanagers, buntings and sparrows all migrate overnight.
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Some reasons are to avoid the heat of the day, windy conditions, and predators. Many species use the stars in the night sky to guide them, and there is some evidence that, perhaps,
magnetic fields at the poles help guide them.
Other large-winged birds such as
hawks,
eagles,
vultures and even
pelicans migrate during the day, as they rely on thermals and updrafts to fuel their flight. They are efficient flyers and use very little energy during migration, allowing the wind to fuel their flight.
When you think about
migration facts, it is astonishing to learn of the amazing feat that many birds accomplish twice each year as they move between their summer and winter range and back again.
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Friday, March 11, 2011
Image via Wikipedia
Image via Wikipedia
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