Never seen them up here before. I'm assuming this is the Texas side? Little or Big Mineral arm? I was surprised when a guy caught a spoonbill in Little Mineral creek last year (well, sort of surprised).
Yep river otters. North East Texas is full of them. They can destroy a stock tank or small lake eating all the fish. We used to have those on our family place outside Canton. They packed up and moved as soon as the shooting started.