Once and a while we put out buckets of soapy water, using plant-based soap, for the chimps’ enrichment. Jamie likes to use the soapy water to clean. Jody shoves handfuls of soapy foam into her mouth as she makes her “dinosaur noise” (actually a combination food grunt and low moan).
I don’t know if she did it intentionally, but the other day, Foxie was actually blowing bubbles.