Some Non-Avian Dinosaurs Had ‘Belly Buttons,’ New Fossil Shows paleontology science
, the developing embryo is tethered to a number of the extraembryonic membranes that deliver oxygen and nutrients and remove metabolic waste products throughout embryonic development. Prior to, or soon after hatching, these membranes detach from the animal leaving a temporary or permanent umbilical scar equivalent to the navel or ‘belly button’ in some placental mammals, including humans.
“Immediately prior to or soon after hatching, this communication is severed and the yolk sac is internalized, although the opening in the abdominal wall may take several days to weeks to fully close, leaving an umbilical scar or umbilicus.”
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