there are many anomalies in the world;

https://www.reddit.com/r/interestingasfuck/comments/13plhx8/this_photograph_taken_around_1885_to_1886/

This photograph, taken around 1885 to 1886, showcases Ella Harper. Harper suffered from a highly uncommon medical condition called congenital genu recurvatum, which caused her knees to bend in the opposite direction. As a result, she found it more comfortable to move on all fours.