Researchers based in the U.S. and Sweden who analyzed evolutionary change in groups of primates found the numbers of males lags behind females. The number of females in a group tends to be larger than the number of males; the more females there are the more males there will be, but only after a period, when the males have had time to catch up to the changing population.

As mixed-sex, multi-male groups are common in more advanced primate societies (including humans), scientists say the study highlights the importance of females in understanding social evolution.

The time lag between numbers of females and males was revealed using a family tree (or phylogenetic tree), with various branches showing relatedness between species.

"A simple example is the relationship between us and chimps which looks like a V," said Patrik Lindenfors, a zoologist at the University of Virginia, Charlottesville. "Chimps are on one tip of the V, with us on the other, and our common ancestor at......

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Title: Animals
Approximate Word Count: 333
Approximate Pages: 2 (250 words per double-spaced page)

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