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Meerkats () live in complex, hierarchical social groups or "mobs" consisting of two to 50 individuals.

These groups are ruled by a dominant male and female, called the alpha pair, that have exclusive breeding rights.

In experiments, Clutton-Brock and his colleagues fed younger sisters lots of food to increase their size.

Older sisters responded by eating more on their own to grow bigger, helping them keep their place in the queue for the crown and the right to breed.

His work covers all areas of science, from the quirky mating behaviors of different animals, to the drug and alcohol habits of ancient cultures, to new advances in solar cell technology.

Subordinate females may occasionally mate with the immigrant males from within the group or outside of the group.Sexual behaviors, risk factors and reproductive health needs were examined among a nationally representative sample of 6,493 women aged 20–44 from the 2002 National Survey of Family Growth.Paired t tests were used to assess differences among single, married and cohabiting women by selected demographic, behavioral and risk measures.The ultimate winner will experience spikes in testosterone and estrogen, as well as a rapid increase in weight and skeletal size, in the three months after taking over, Clutton-Brock said.Interestingly, recent research shows that subordinate meerkat sisters in a group actively compete with each other through eating.

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