53-million-year-old rabbit's foot.
The Johns Hopkins University School of Medicine anatomy professor unearthed curious bones in India several years ago.
He suspected they were important but could not identify them. So he stored them in a drawer until serendipity struck in spring 2007.
"One day I was teaching my mammals course and showing the [students] the foot of a jackrabbit, and I said, 'Hey, that's what we have in the drawer.'"
That fateful foot now appears to belong to the world's earliest known rabbit found so far, some three to four million years older than its closest contemporary.