ScienceDaily Posted April 8, 2013 Share Posted April 8, 2013 A new study suggests swallows and martins breed indoors and close to humans to avoid having to rear cuckoos. Some species of birds reproduce not by rearing their own young, but by handing that task on to adults of other species. Known as brood parasitism, this habit has been most thoroughly researched in the cuckoo. Previous research has found, however, that the nests of martins and swallows in Europe are rarely parasitized by cuckoos. Read the full article on ScienceDaily Link to comment Share on other sites More sharing options...
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