from wiki:
...Females average four breeding seasons in their life and give birth to 20 to 30 live young after three weeks' gestation.
.... As there are only four nipples in the pouch, competition is fierce and few newborns survive.
30 pups, 4 nipples...gotta go viscious angry early to survive.
Is that 20 to 30 in each litter, or over their breeding life?
I’m guessing it means a total over their breeding life.