Internal - they're mammals.
Platypus fertilisation occurs internally.
They Have Internal Fertilization
internal fertilization
Giraffes have internal fertilization. Giraffe gestation lasts 400 to 460-days. The mother gives birth standing up to a single calf. The mother then grooms the newborn and helps it stand up.
internal
external fertilization
they use internal fertilization they use internal fertilization they use internal fertilization they use internal fertilization
internal external not internal external not
Clams utilize external fertilization.
Salmon use external fertilization
Reptiles ONLY have internal fertilization
no (JP MAURYA)