Weird skeleton found on image taken by Mars Opportunity

On February 2, 2018, by considering images caught by Mars Opportunity, a person living in Waxahachie, Texas, noticed skeleton of a living being.

Witness report on MUFON:

I looked at Mars images. For Opportunity SOL 4986 I looked at 3D image. I could see

Face and details of spine. Date of SOL 4986 is February 2, 2018. Was

Source, 22th February 2018