parathyroids
... that the parathyroids were first discovered in the Indian rhinoceros in 1852 but not identified in humans until 1880?
... that the <b id="mwB_w"><a href="./Parathyroid_gland" id="mwB_0" rel="mw:WikiLink" title="Parathyroid gland">parathyroids</a></b> were first discovered in the <a href="./Indian_rhinoceros" id="mwB_4" rel="mw:WikiLink" title="Indian rhinoceros">Indian rhinoceros</a> in 1852 but not identified in humans until 1880?