Puzzle 231

In the Wistar Institute of Anatomy and Biology, five Tailless rats were born out of 40,000 rats between 1915 and 1917. They were observed, and three were dissected so the vertebrai could be examined. The lumbar vertebrai were modified and the pelvic girdle was only attached by a small surface near the anterior end altering the angle of the hind legs , resulting in the lifted rump.