Endothermy is often a synapomorphy of the Mammalia, although it could have arisen in the (now extinct) synapsid ancestor; the fossil record isn't going to distinguish these opportunities. Convergent in birds. SF story a couple of prosperous guy who develops systems so Highly developed that everybody thinks they're evidence of https://devinmdtkz.post-blogs.com/57368313/grúas-industriales-para-trabajos-en-la-rinconada-for-dummies