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You become a fully grown adult.
Koalasare fully grownby their third or fourth year.
About 2 years
They may appear to be female until they become fully grown... If they are all fully grown and still look like females, then you are very unlucky
1 year
they get big as a big ball
they are fully grown when they are 6 years old
The emperor penguin can grow up to be 20 years old.
Athena was born a Greek goddess armored and fully grown from the head of Zeus.
no. a maltese is fully grown at one year of age
The size of an animal when they are fully grown varies. Full grown elephants are much bigger than a full grown cat.
There are no snake species that I know of that are fully grown at 18 months. Some males may become sexually mature at that age, but they still have a few years or more of growth ahead of them and are not physically mature.