Placental mammals reproduce externally. (not in pouches)
All foxes are mammals and reproduce internally.
Externally.
internally
internally
externally
External, like most fish.
Female goldfish have ovaries to produce eggs, and reproduce externally. Male goldfish have internal testes, and they also reproduce externally.
Horses are mammals and reproduce internally, and the female gives birth after a gestation period of about 335 to 340 days.
Dolphins reproduce internally and give live birth.
internal
Baby mammals cannot reproduce, they have to be mature.
No. Platypuses are mammals, and all mammals reproduce sexually, not asexually.