It is not actually a horn, but a tooth, and it can grow up to 9 feet long (no joke)
A very long time.
Sloths grow up to 5 metres long
A narwhal's tusk, which is actually a long, spiral-shaped tooth, can grow to be about 9 feet (2.7 meters) long.
It takes between three to five years for a lion to fully grow.
an alligator can live up from 40-50 years but there was a large age that i do not know of:)
No.
alligater
Yes as it has a spine...
its a reptile
coyote and alligater
a shark
yes
When it is very young
Yes.
what is a alligater
Nope - it's a reptile !