Cave Art: These Paleolithic people amputated their own fingers

Science Alert
In ancient cave art around the world, a particular motif shows up time and again: the impressions of the hands of the people who visited long ago, printed or stencilled.
And yet, in some caves decorated by the Palaeolithic inhabitants of France and Spain, something curious has been observed: A very high number of those hands seem to be missing fingers.
Others argue that the people who inhabited those regions engaged in a grisly practice: amputating their own fingers.
Sounds insane at first, but let’s hear this out – a new study has just added its voice to the amputation side of the debate.