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Female chimps and bonobos, on the other hand, are decidedly polyandrous.

The participants in Prof Machoko's study all lived separately but were committed to the polyandrous union and were open about it among themselves.

And scientists suspect that, like their polyandrous cousins, female kalutas are capable of internally stockpiling sperm for up to two weeks before fertilization.

And in both studies human semenogelin genes lie closest to chimpanzees and bonobos, suggesting that our common ancestors were polyandrous females and sperm competing males.

Trees or shrubs, with naked buds and no stipules, a calyx of 3 sepals, and a corolla of 6 petals in two rows, valvate in the bud, hypogynous, polyandrous.—Petals thickish.