Their skeletons revealing bones of tiny hind limb is an example of a vestigial
structure.
Vestigial structure is an anatomical structure in which there is no longer a
function for it in the organisms they are present in. They are mostly seen in
the skeletal structure and an example is the bones of tiny hind limbs found
in pythons.
These structure have no function as snakes don't use limbs to move from
one place to another. They use their belly which makes the bones of tiny
hind limb a vestigial structure.
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