i think the mammal thing is like the mammal thing with lions. there is one female alpha-lion who gives birth to the babies, the other females are not fertile. the alpha-lion can breastfeed the babies, but the other female lions can do, too. so they have "breasts".
maybe that's like the way it works on oddworld.
for the egg-laying species: on earth is also a mammal-spiecies who lays eggs (i forgot the name).
cheers,
.:VaniLLaKiLLah:.
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