Anyway, if you didn't notice, monkeys are more active now. They will walk around, defend and attack, follow people, pick up items and such. Very nice.
Few ideas,
Make them like slimes so they grow attached to you if you do nice stuff to them, like give clothes, feed, heal.
Make them hide in vents when in peril.
Add the walk around and follow code to other pets too!
Bonus:
Mammals vs Lizards Race War.