Your question is rather vague. I feel you might be referring to the large pink swelling located on their bottom. If so, that is actually a genital swelling on a female. This lets males of the species know that they are receptive to mating and becoming pregnant.ANS2:I'm going to venture the person wants to know what ischial callosities are.
Ischial tuberosity
Ischial Spines
ischial tuberosity
You can eventually get an avulsion fracture or separation of the ischial tuberosity or apophysis.
Patches of skin on a whales head made up of lice and barnacles.
15940
No. But they are often covered by barnacles on their chin and ventral pleats (throat grooves).
jljl
ischial
see link below
Ischial tuberosity