Variation among ungulates in pigmentation of the bare skin of the anus, perineum, udder, inguinal area, and stifle-fold
The perianal/perineal bare skin, ventral to the whitish base of the tail, is somewhat pigmented in the blesbok (https://www.inaturalist.org/observations/69719656).
The following shows that in the vicuna, as in the guanaco, the bare skin on the ventral surface of the tail is pale (depigmented), despite the pigmentation of the perineal skin, around the anus and vulva.
https://www.shutterstock.com/it/image-photo/del-chimborazo-natural-fauna-national-park-2226795159
This contrasts with gazelles, in which the bare skin on the ventral surface of the tail is blackish:
Gazella marica
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