Duke University Department of Biology, Associate Professor Sarah Lipshut, the researchers team found that only bird women who build nests in existing tree cavities show significantly more aggression than other species. Published in İş Magazine Ecology and Evolution of Nature (Nee).
These birds cannot create gaps on their own and are forced to look for ready -made shelters in the trunks of trees, fences or rocks. The loss of such a rare source can cost them to reproduce, so that they protect their nests from violently violating them.
Scientists compared the behavior of the relevant species with different nesting strategies and examined five birds – swallows, woody singing birds, sparrows, drozds and urticaria. In the experiment, the railing was built next to the nests and the sound of birds were reproduced. The results have shown that it is a nesting strategy, not the level of associated bonds or testosterone levels that affect the aggression of behavior. Females were particularly aggressive.
“It was a really incredible behavior difference, Sara Sarah Lipshut said. “Competition pressure for nesting places increased aggression among women, especially among women.”
When a team of researchers tried to find genes directly related to aggression, the results were unexpected: there were no “universal” genes responsible for any aggressive behavior. Instead, each bird has its own gene set of combination.
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Source: Gazeta
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