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The penalty of having a sister -- why sibling sex matters for male saiga antelopes
03-06-2007 · EurekAlert!Having a twin sister could put male saiga antelopes at a reproductive disadvantage, says new research published today. The study shows that male twins with a sister are born lighter than those with a brother, making them smaller than the optimal size for males. The research also shows that saigas are the supermums of the hoofed animal world with no other similar species investing more in their offspring during pregnancy.
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Keywords: penalty, sister, sibling, sex, matters, male, saiga, antelopes, matter, antelope
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