I found this book on Otters up on the fourth floor and zoomed through it while waiting to take my shift at the Booknook. I just love otters, and we have a nice pod of them right here in Vancouver, just a few miles north of Frenchman's Bar at Fisherman's Slough. The American River Otter is friendly to the point of getting scary sometimes. They are very gentle and playful, but cautious at first, so give them space, but remember, if you bring some baitfish, you just might be able to tempt them in for a treat.
Here is a video of an otter that was just taking a break from the water to get in a good scratch.