#1) Very long arms
I will add very high trees to the zoo so the orangutans can swing around and find fruit in the trees.
#2) Legs are short
I will also add really short trees to the zoo so the orangutans can reach fruit from the ground.
#1) Sleep at night in nests
I will add a lot of vegetation to the zoo so the orangutans can make their nests with it.
#2) Older ones mostly walk on their fists
I will add a soft ground to the zoo so the orangutans' fists won't get hurt.