Endothermy is really a synapomorphy from the Mammalia, although it can have arisen in a very (now extinct) synapsid ancestor; the fossil file doesn't distinguish these possibilities. Convergent in birds. Nevertheless, it can be done that there's confusion listed here in between the White Stork and the greater northerly-breeding Widespread https://gunnertt49v.blogminds.com/details-fiction-and-stork-24381751