Cow bones found in Grandma’s pasture.
For my children who have been raised in the city, adventure trekking through grandma’s cow pasture is always sure to yield a few exciting surprises. This time old cow bones were discovered scattered in a ravine. They were quickly collected, of course, and brought back to the house for further inspection. Mom here, of course, saw an excellent opportunity for a bit of learning. 
I had to get online and find a few good sources for us to read and learn more.
Related Links and Discussions: cow anatomy, animal decomposition.