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At present bonobos and chimps aren't that different from each other by appearance, but based on their lifestyles I exepct this to change quickly. Unlike their more burly sibling species, Pan paniscus are matriarchal and geared more towards sex than violence [the hippie apes who make fuck not kill]. The major driving force that'll further differentiate them from chimps is what's referred to as "sexual selection" where the choice of mates influences evoluiontary change. And with all that wild'n'crazy sex the raw magnitude of "stimulation" should push changes to the brain and nervous system to new heights.
Now the male's gotta do something or be something for a female to take interest. Being just as much the tool user as chimps, bonobos might go the route of bower birds. Every male becomes an artist and every female an art critic. If the guy shows enough panache the lady might decide to stay the night at his highly decorated pad. I figure this the more likely scenario than for bonobo males to develop physical colorations meant for attracting mates due to the emphasis on behavior for their survival. To be the best decorator could demonstrate the male's resourcefulness and food gather efficiency high enough to offer spare time for leasure activities.
A plausible explanation for why anatomically modern humans developed greater mental faculties and suddenly took to making objects with less emphasis on functionality, such as shells and beads some 70,000 years ago. This isn't to say bonobos would necesarily follow our road to advanced civilization or leaving thumb baring footprints on the moon, but the construction of shelters from woven grass and sticks generously decorated with colorful flowers and other bright ornaments from nature is very likely.
by the time lionzee appears a future zoologist would be hard pressed to see the resemblance of their little brothers and sisters, the Bower Bonobos.
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"In space no one can hear you scream. in D.C. it won't matter..." -Clinton Resurrection: The Alien Queen lives!
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