Well, that depends whether it is male or female.
The female generally receives sperm from the male during sexual intercourse of some kind.
As for males, it is hard enough to discern when a human male gains sperm or reaches puberty, without trying to guess when a male animal is finally ready to impregnate ... and, of course, it will be different from specie to specie.
No, not all animals have sperm. Amoebas and some other protists are technically animals but reproduce asexually instead of with sperm and eggs.
Almost all animals begin as an egg and a sperm. There are a few exceptions, though, such as sea sponges. But for the majority, they begin as sperm and egg.
All animals produce about the same amount of sperm.
sperm cell is the typical sperm of most animals has a head containing the nucleus and acrosome
The sperm whale.
Depends on the animal
Like all other animals there are female Sperm whales.
sperm whales
Yes. All animals are living right? They all have sperm.
In animals it would be called a sperm. In plants I assume the answer would be the pollen, however, the pollen is not necessarily one cell. Even if it is one cell it will have more than one nucleus (2 or 3).
No, but they are listed as "Vulnerable".
No, sperm is not considered an animal. Sperm is a reproductive cell produced by male animals, including humans, but it is not a separate organism or animal on its own.