Wolfwalkers

 Wolfwalkers is an animated film from the same director as The Secret of Kells. It has a similar sort of art and line style, with movements easily flowing across the screen in a way I found very aesthetically pleasing. You can read the plot summary on Wikipedia, so I'll just give some viewing notes:

If possible, you should view this on a bedsheet in a neighbor's backyard.

Cover your delicious blood with skin, and cover that with clothing, then bugspray. (You will still be bitten on the face, and hands, and through your socks. This is the destiny of the delicious. Your itchy discomfort will be offset by the bug-free experience of neighbor kids.)

At the appropriate time --- and trust me, you will know the appropriate time --- you should absolutely howl along with the onscreen wolves. Everyone else, on their lawn chairs and picnic blankets, will absolutely do this, especially if < 7 years old.

Five stars, highly recommended. Not entirely historically-accurate.

This post's theme word is eidolon (n), "an idealized form" or "a phantom". The animation smoothly showed transition between physical humans, eidolon scents and spirits, and wolves.