Why have great apes no acces to trees ?

I've seen Melbourne's enclosure and liked it a lot.

It has that full canopy you often mention as giving the apes a sense of security. Unfortunately just based off my experiences: Otana hasn't been great for the troop from a purely public interest point of view. What was once a large boisterous troop is now a small, subdued and shy one. The best glass viewing area is permanently closed off due to his dislike of the public being so close. I really wish they'd modified the old ape grottoes into a 2nd gorilla exhibit rather than create the mediocre lemur walk-through. Gorillas were always Melbournes star attraction and two troops rotating exhibits would have been revitalised interest.
 
It has that full canopy you often mention as giving the apes a sense of security. Unfortunately just based off my experiences: Otana hasn't been great for the troop from a purely public interest point of view. What was once a large boisterous troop is now a small, subdued and shy one. The best glass viewing area is permanently closed off due to his dislike of the public being so close. I really wish they'd modified the old ape grottoes into a 2nd gorilla exhibit rather than create the mediocre lemur walk-through. Gorillas were always Melbournes star attraction and two troops rotating exhibits would have been revitalised interest.

Yes arrival of a new male/change of group dynamic can change everything from a visitor perspective as well. London had a similar problem when new male Kumbuka arrived( he has since died) hitting the windows etc so they had to make more restricted viewing as a result. The presence or lack of juveniles in a group always makes a big difference too.
 
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