It's all in the feathers, man. Do not be fooled - it is but a clever façade.



When I lived in the Mojave, my dad brought home a big 6-foot diamondback rattler which he claimed to kill with his bare hands and a knife (it had tire treads from his 18-wheeler on it), and proceeded to behead it, gut it and cook it on the barbecue with all the neighbours. As in, the neighbours joined in, we didn't cook them.



Anyway, on the inside of the stomach was a half-digested roadrunner - and from my memory as a 3-year-old, it looked like a ball of fluff with legs sticking out. So I'm guessing there's a fair enough featherage to puff out when they need to keep warm at night.



That, or you're right and the artist drew it a bit fat. Meh. Either way, I told a story! :)