25% of people in a Zimbabwe tribe are born with only 2 toes!
It's due to a rare genetic condition called ectrodactyly, or also "lobster claw syndrome." Although it occurs in the general population, it is particularly common in the Vadoma tribe of western Zimbabwe. The genetically-dominant condition affect about 1 in 4 babies born into the tribe.
Could it be an adaptation? Some theorize that it might have an adaptive benefit if it aids in tree climbing. However, the most likely reason for this condition to persist in this population is two-fold: 1. The trait is genetically dominant, and 2. The gene pool is limited amongst the Vadoma. It's against tribal law for people to marry outside the group.