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If you can't listen to other individuals, you don't know what you should be learning.
Researchers found that a large number of male birds appear to be learning tunes only used by other species. about 12 percent of male regent honeyeaters end up producing versions of songs usually sung by friarbirds and black-faced cuckooshrikes, among other birds.
The scientists released their research in the publication Proceedings of the Royal Society B. They found that males who sang unusual songs were less successful in attracting mates.
Peter Marra is a conservation biologist at Georgetown University and was not involved in the study. He said, This research suggests that the loss of a song language once the population reaches a very small size could accelerate their decline.
The exact reason females do not accept the males was not clear.
Scott Ramsay is a behavioral ecologist at Wilfrid Laurier University in Ontario, Canada. He was not involved in the research. He said the songs were like an adverti百度竞价推广ent: When male birds sing, it's like putting out an ad saying, I'm over here...and I'm really interested in finding a partner.'
Ramsay added that female honeyeaters may not even recognize these unusual singers as possible mates, and so do not approach them. Or it could be that they approach, but then things go wrong if the males do not behave as expected.
Most male birds spend several months in their first year learning the songs they will sing for the rest of their lives. Some birds learn from their fathers. But regent honeyeaters leave the nest before they learn to sing, so the males need to find other birds to learn from.
Carl Safina is an ecologist at Stony Brook University and also was not involved in the research. He said, We need to be aware of the importance of preserving song culture in birds...some elements of what these birds need to do to survive isn't instinctive, it has to be learned.
Crates' team has begun putting their findings into action. To help young birds in reproduction programs learn their notes, they have started playing male song recordings. They have also placed skilled male singers next to young learners. The hope is that these experienced birds can pass on their songs to the next generation.
I'm Jonathan Evans.
Christina Larson reported on this story for the Associated Press. Jonathan Evans adapted this story for Learning English. Mario Ritter, Jr. was the editor.
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