Evolution can only be described in such a way that the advantages of emerging or changing organs

Parade, Cusco, Peru, 27. 8. 1989
Parade, Cusco, Peru, 27. 8. 1989

are clear at every stage of development. Plumage, which – like the fur of mammals – serves to maintain body heat and only developed feathers became useful for active flying and gliding much later, is plausible in the sense of evolution because the selection advantage becomes visible at each and every stage of evolution as well as in every generation of living beings.

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