Well, those other mammals aren't sending their placentas out to be dehydrated and put into little capsules either. They just chow the sucker down raw and whole right on the spot.
Yep, this brings to mind an old joke about a veterinarian who subbed for a country doctor while the latter was on a fishing trip. His only problem while tending to the MD's patients was the reluctance of one new mother to consume the afterbirth.
Never thought I'd see that go from a joke to a sick, twisted actual practice.