I want the frog robot!

Using a multimaterial 3-D printer, a group of scientists led by Robert Wood at Harvard University created a froglike robot from both rigid and soft materials. [Nicholas W. Bartlett et al, A 3-D-printed, functionally graded soft robot powered by combustion]

The robot's body is stiff near the core control center, making it durable enough to be combustion-powered, while the bot's flexible outer edges help it stick the landing.

It could make friends with the dog robot bob's getting me.

If they could construct one powered by pollutants in the air, it would be a perpetual motion device until it left the confines of a large city.