By having sex
emus will not mate with humans they can only mate with their own kind
Some do mate for life, but some don't.
Cats, like humans, naturally know when/how to mate.
like humans do
No, not legally, and no offspring can be created.
It is physically impossible for a human to mate with a penguin. They are two different species with no ability to produce an off spring by the fusion of their sex gametes.
no but humans can make horses mate with the same patner all there life
Yes, Neanderthals and humans were able to mate with each other, as evidenced by genetic studies showing that modern humans of non-African descent have Neanderthal DNA in their genomes.
they mate in feilds by humping each other and haveing babys and love humping humans
they mate during the end of the world so when everyone dies there are eggs left then hatch to pumas and since there are no humans the magically change to humans and the world starts again.
It's highly likely they don't.
Just as much as humans.