Laptop Battery In a rite of spring nearly as old as the Nebraska sandhills, greater prairie chickens and sharp-tailed grouse gather before dawn on their respective dancing grounds at Valentine National Wildlife Refuge in the north-central part of the state.
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Thinkpad While females watch, the males lower their heads, raise their tails, spread their wings, inflate colorful air sacs on their necks and stamp their feet while making hollow cooing or moaning sounds. The basic purpose of this elaborate display is to attract a mate.
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Microsoft Indeed, the dancing ground, or lek, is the avian equivalent of a singles bar, said Dr. Robert Gibson, a behavioral ecologist and professor of biological sciences at the University of Nebraska. But Dr. Gibson, who has studied lekking behavior around the world, is convinced there is more going on.
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Laptop Computers While the male grouse assemble every morning from late March to early May, females come and go, Dr. Gibson said. "Some days two or three females will show up, other times none at all," Dr. Gibson said. "They may visit several leks before selecting a male to mate with. And it turns out they usually pick the same guy, or a very small subset of the guys gets chosen."
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Laptop Computer "What you have," he continued, "is a group of males who are doing something together but only a few of them are getting anything for it in terms of reproductive success."
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Desktop Computer Dr. Gibson says the grouse are looking for more than the opportunity to pass their genes on to the next generation. "They're also trying to stay alive in this one by joining a group to evade predators," he said.
Notebooks In a paper in The Proceedings of the Royal Society, Biological Sciences, Dr. Gibson pointed out that conspicuous courtship displays attracted predators as well as mates, and that grouping to avoid predation was common in the animal world. He proposed that male grouse join leks for the same reason.
Lenovo The birds have a long list of enemies, including coyotes, foxes, badgers, hawks and golden eagles. But during six weeks of watching leks at Valentine, Dr. Gibson and his research team found evidence to support the hypothesis. "One of the things we noticed was that male prairie chickens visited sharp-tailed grouse leks but not vice versa," he said.
Hard Drive Their observations were confirmed when they reviewed the long-term records of a retired Fish and Wildlife Service biologist, Leonard McDaniel, who had counted birds on the refuge's 20 to 30 leks every spring.
Travelstar "If a male prairie chicken's chances of mating are already small when he joins a lek of his own species," Dr. Gibson said, "it stands to reason they are not improved at a sharp-tailed grouse lek. Our finding suggests that they benefit from lekking with sharp-tails, which in turn implicates predation."
Gateway In other words, a male prairie chicken in a sharp-tail lek isn't necessarily looking for love in the wrong place he's just trying to survive.
By Les Line
New York Times - 4/29/2003
Topic: Birding
