Tricky business this overlay stuff - never mind mixing words with it.
I'm full of admiration for clever folk like Jutilda
The Poem is by a 15 year old Refugee, and it struck me that Zoo animals are in many ways like refugee's, displaced from their homelands, historically against their choice, and while they might be in a safer, better environment now and live to a greater age I wonder whether deep inside there is still the stirring for the home they can't return to . .
I like your sensitivity to the captivity of the zoo animals without leading in a particular direction. The overlay and the poem are wonderful combined with the monkey.