Make your show fit around the idea of being in the forest.
Maybe paint the tent with a jungle look.
Through out the show talk about how you found this animal on
your
last journey to the forest and pull things out of it.
Then through out the show a shadow of a gorilla would show
up but ever
time you open the tent nothing is there.
F finally at the end of the show the tent would be shown empty
zipped up
and the gorilla would come out of the tent but inside the Gorilla
suit is the magician.