the.com/plastron
the turtle's built-in breastplate, proof armor was a fashion statement first.
bony originEvolved from ancient belly ribs and collarbones
hinge modelsBox turtles slam theirs shut like a vault
fencing tooNames the padded chest guard fencers wear
sex tellConcave plastrons help males mount rounded females
ancient roots260-million-year-old turtles already sported one