The skeleton of glass frog with bones.
Explanation:
In most species of the Glass frogs, the underside surface beneath their body is visible where we can see their bones, beating heart and blood vessels.
Since the bones of the glass frogs are visible from outside it helps to identify which species they belong to.
In most of the species of glass frogs bones are found to be green in color.(Pacific giant glass frog, Pichincha glass frog, and Ecuador Cochran frog)
Certain species of glass frogs bones are white. (Fleischmann's glass frog, Atrato glass frog, and La Palma glass frog).
The toe bones of glass frog species are T-shaped at the ends.
In glass frog species males have one sharp bony spine on the upper part of each front leg and it is known as "humerus".