WATCH: Los Angeles Zoo celebrates milestone after their great ape baby boom

David Muir reports on how much the great apes have grown over the past year – and what their births mean for the endangered species.

​David Muir reports on how much the great apes have grown over the past year – and what their births mean for the endangered species.  WNT David Muir reports on how much the great apes have grown over the past year – and what their births mean for the endangered species.