Koba was a Bonobo NOT a Chimp...
There are five Great Ape species.
I think we all know three of them:-
Chimps
Gorillas
Orangutans
Perhaps we'd work out us ourselves, i.e. Human, are one.
But the last is the Bonobo.
Don't really know too much about the Bonobos but there you go, they complete the set...
Don't think they were previously featured in any of the POTAs until this one.