There is no external water source to carry the sperm
Cats fertilise internally.
No - they fertilise internally.
internally
All reptiles fertilize internally
Koalas do not fertilize their young. They fertilize each other (internally) to produce young.
they fertilise the land
An egg carried internally
An egg carried internally
The male inserts his 'gonopodium' into the females 'cloaca' and releases his milt (sperm). Her 'ova' (eggs) are then fertilised internally.
Amphibians (frogs, toads etc.), birds and fish. NOT REPTILES.
Kangaroos fertilise internally. However, development of the tiny joey primarily occurs externally, as it undergoes most of its development in the mother's abdominal pouch.
When the female lays her eggs the male will come and fertilize them so that they can become babies. Or if the female does not want that she'll scare away the male so that no babies can be made. +++ The only animals that use external fertilisation as that answer describes, are the fishes. All other egg-laying animals fertilise internally, before the egg is developed and laid.