This tarsal, the calcaneum, is often found as a fossil because the bone is dense and because in life there is little meat on the bone to attract carnivores. Calcanea (plural) are diagnostic -- that is, they can be identified to family or genus. In this image, You can see (if you look carefully) the differences in this tarsal of a horse and the same tarsal from the related tapir.
(This image is best viewed by clicking on the "options" button
on the upper right of this page => "view all sizes" => "large".)