primates, for example, have the second highest speciation rate among mammals, with one speciation event per lineage every 3 million years. however, not all primate species have a high speciation rate; this is reflected in their deme size and social structure. geunons ("cercopithecus"), for example, live together in small polygynous troops and are a quite diverse genus. on the other hand, baboons ("papio") have a much lower speciation rate. baboons have larger deme sizes because they live in polygynous multi-male troops. these baboon demes are usually allopatric but gene-flow still exists between demes with hybridization being common.