>>21241397Only in placental mammals, and different lineages have different viral genes that end up producing similar proteins. Not sure if anybody has done this sort of research on the placentas of viviparous skinks either.
>>21241352There are oviparous mammals. Their mammary glands might be rather crude compared to eutherians, but it's Pokemon and Pokemon are different from animals so who cares. Pokemon based on bats can breed with birds but not with other mammals. Don't take it too seriously, especially when it's for the purpose of fapping.
