This deer vertebra, resting on a bed of reindeer lichen, was old and chewed, but was also the home of a large slug. A second vertebra -- found far away from this one -- also had a slug living inside, where the spinal cord was once housed.
It was rather surreal, being able to see the bones so easily from the hardly-used trail. Even more bizarre was the fact that they were all so far apart from one another. Spotting the bones as we walked along was almost like a treasure hunt.