Imagine a saber-toothed predator—but instead of being a big cat, it’s a marsupial. Thylacosmilus was a bizarre prehistoric mammal with huge fangs, yet it carried its young in a pouch.

Related: Ancient marsupial sabertooth had eyes like no other mammal predator Placental mammals have a range of developmental strategies. For example, human babies are practically helpless at birth ...

Marsupials are fascinating creatures with their own built-in pouches. These are animals like kangaroos, possums, and koalas. Although they are mammals, their pregnancies are super short, lasting ...