Sex chromosomes influence physical differences between male and female animals, such as feather patterns in mandarin ducks. In most animals, sex chromosomes help determine whether an individual develops as a male or female. Sexes of some animals, such as most male arachnids, lack a second sex chromosome entirely. These chromosomes contribute to the physical differences between males and females. Birds with ZZ sex chromosomes, for example, are male and tend to be more colorful, whereas ZWs are females with typically blander plumage.
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These apes supposedly have inordinate amounts of sex and never fight. Can this appealing story really be true? Reputation: Bonobos are miniature, sharing, caring chimps, living in hippie communes with no aggression and lots of sex.
The bonobo is distinguished by relatively long legs, pink lips, dark face, tail-tuft through adulthood, and parted long hair on its head. The species is omnivorous and inhabits primary and secondary forests , including seasonally inundated swamp forests. Because of political instability in the region and the timidity of bonobos, there has been relatively little field work done observing the species in its natural habitat. Along with the common chimpanzee, the bonobo is the closest extant relative to humans. Bonobos live south of the river, and thereby were separated from the ancestors of the common chimpanzee, which live north of the river.