Officially this is an estimate, but having been where these animals live, I believe we can have an exact count. Keep in mind that when we say “globally” this means a tiny region straddling the border between Rwanda, Uganda and Congo.
We are talking about a few families of gorillas, some of which are tracked daily. There is a massive conservation effort on these animals, at least in Rwanda and Uganda, they all have names and I don’t think a gorilla is born without someone knowing about it
If there are really 1063 I would think conservationists could know about almost every one individually. That's smaller than the high school I went to. I know they are spread out over a wide area in a dense jungle but I think it would be possible.
We are talking about a few families of gorillas, some of which are tracked daily. There is a massive conservation effort on these animals, at least in Rwanda and Uganda, they all have names and I don’t think a gorilla is born without someone knowing about it