The frilled dragon exhibits a distinctive large erectile ruff. Researchers report that an ancestral embryonic gill of the dragon embryo turns into a neck pocket that expands and folds, forming the frill. They demonstrate that this robust folding pattern emerges from mechanical forces during the homogeneous growth of the frill skin, due to the tensions resulting from its attachment to the neck and head.
from Latest Science News -- ScienceDaily http://bit.ly/2KzlLXn
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