I often get asked what the difference is between Tans and Otters. Yeungling's litter gives me the perfect opportunity to show them, although with one hand holding a bunny and the other a camera, I could not get a really good, definitive pic of the under color.
Here are a Tan and an Otter side-by-side. If you look closely, you can see that the bunny on the left has more pronounced orange markings on its nose and more ticking up its flanks. If you look really hard, you can even see hints of pea markings in front of its ears, and its eye circles are also easier to see. The Otter, on the right, has smaller, less defined markings.
Also, Otters will have slate under color on their bellies. Look at the belly right under the arms, since both colors will have lap marks near the hind legs. I have not captured it well in this photo, but when you compare it with the tan belly pictured below it, you can see that the top photo of the otter has a cool slate cast to it, from the under color showing through, whereas the tan below has a nice, clean warm cream color all the way down to the skin. This is a result of the Tan having 2 recessive wideband genes which clean up the under color.
I 'll post more pics shortly, Blogspot seems to get temperamental about too many pics in a post.