(In regards to the first comment below about a better resolution photo)
Here is one of the raw-data photos and if you click to enlarge it you can see the full size and maybe can enhance it a bit with a good photo program. I enlarged them and cropped them and lightened them a bit to get the close up images in the photos at the bottom, the top photo is right out of my camera. Maybe they are beavers and from the side the tails looked round and furry the way the light was coming from the side, I can't say as I didn't see the tails, just my husband did but we weren't all that close. But they didn't act like the beavers we've seen before, the way they were swimming around together, diving and coming back up. We often see beavers at Presque Isle so we know what they normally look like, these just didn't act like it but maybe they are young, frolicking beavers.
Sunday we headed to Presque Isle with our canoe. We launched at the lagoons and our canoe slipped quietly into the magic land that only Preque Isle can deliver. The amount of wild life that you can see up close is amazing. We fished for a while and caught some small bass and sunfish but the real show was the swallows (maybe they were purple martins). There were so many of them. Huge flocks dove into the water with splashes like dive bombers. It was an amazing sight.
We also saw a pair of what we think were otters. They didn't have a beaver tail and they dove and swam like an otter. By the time the camera turned on, they would dive again. You could see minnows and small fish jumping where they were swimming under the water. I did catch these somewhat fuzzy pictures (not unlike the bigfoot photos, ha) of the animals when I enlarged the pictures. I didn't see the tail but my husband did and said it had nice fur, not a beaver tail, plus the heads were not course like a beaver. Maybe it is common knowledge that otters live in the lagoons but I never saw them there before. I've seen them at Oil Creek but not here. See photos below.
Also amazing is a drive after dark in Presque Isle Park, you should try it. I think the road doesn't close until 11:00 pm. Drive slowly so you don't hit any of the night-time creatures. You will see raccoons, deer, rabbits and animals you probably can't identify. The park belongs to the animals after dark.
Photos taken in late afternoon/evening on the lagoons of Presque Isle State Park. Are they otters? I'd like to hear if you have seen them there or if you think they are otters.