https://calacademy.org/sites/default/files/styles/manual_crop_standard_960x540/public/assets/images/misc/two_parallel_cutmarks_made_by_stone_tools_on_the_rib_of_a_cow-sized_mammal.jpg?itok=CgvxxVjO&c=3eacd7c27b09cdf27604180ba16f554e