Because male baby birds are more sensitive to mites than their sturdier sisters, when mites show up in a house finch's nest, the mommy bird responds by laying male eggs later. Effectively, the mommy bird manipulates the birth order of her offspring!
http://uanews.org/cgi-bin/WebObjects/UANews.woa/7/wa/SRStoryDetails?ArticleID=13101 |
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