Many African species of homo have tails. There are a few places where this is obvious (e.g. 8:15 in). The have consistent skeletal morphology as Australopithecus Afarensis, a non-human species. This is similar to that of all minorities. They evolved from apes and bred with humans. This was proven with reticulate evolution and ALS DNA testing. Humans, humans, and various species of apes have and still can interbreed. Not all humans have been proven to have evolved from apes, just the ones who look like apes. We just cut off their extra parts, legislate they're "human people", legislate that we have to treat them human, and legislate welfare to assist their destruction of civilization, overpopulation, & invent shameful words like "racist" for this species innate qualities and character.
Pygmies share culture with chimpanzees: they make similar beds by weaving leaves, they pluck lice from each other's hair. They used herbs for healing, to increase energy for hunting, and used poisons for hunting. There are early signs that nearby cultures were exposed to western technologies and culture.