This pack is intended for use as texture brushes for 3D modellers, it contains eleven bone textures whose source images were found on wikimedia, their licences were either cc by 3 or GPL1.2+ so they can be packed together under GPL3+attribution. There is a txt file within the zip which also contains atrtibution details. The bones are cow, pig and horse bones.

From wikimedia:

 Equus Grevyi 01 - H zell

Cow Horns - Paul Miller

conde Nasenbein grob - Xalbar

Sinus frontalis pig - Uwe Gille

Cow Horns - Paul Miller

As always, if you use these I'd love to know, its not mandatory, but its always nice seing your work being used. :)