I really love it too! Seeing these things zipping around the zoo with the big smiley faces would be an absolute blast, I think kids especially would get a kick out of them. Love that idea to paint them like animals, a tiger striped one would be super cool. Plus they're practical like you said and take a load off of the keepers. Might be a lot less need for the classic golf carts. The one thing is getting them down the Domain, not sure if they'd survive that trek.
It's crazy that we really are living in the future, never in my life did I think I'd see a robot at the TZ but the times are a-changing as they say