help with kids room

i can not find the heart in the circus. i found all the equations and cant find the heart to complete the kids room. HELP! I have clicked the whole area and still cant find it.

There are 4 hearts in that scene. I'm not sure which one you can't find. One is at the top of the house (near the roof). One is on the Ferocious Beast sign (above the tiger), one is on the barrel above the pig, and one is one the ground in front of the motorcycle.