Endothermy can be a synapomorphy in the Mammalia, although it could possibly have arisen inside a (now extinct) synapsid ancestor; the fossil report will not distinguish these alternatives. Convergent in birds. Adult white storks have extended pointed purple beaks, very long pink legs with partly webbed feet on the end https://andersonhe72a.frewwebs.com/27086365/5-essential-elements-for-stork