This morning I woke up just before 4 and wandered down to the Thame. I listened to two reed warblers for a while and then noticed some larger slower ripples in the surface of the river than could be caused by fish. At first I thought it must be a moorhen and I walked as quietly as I could downstream. I became aware that there was a bow wave heading upstream towards me. All of a sudden, this wave resolved into an otter, paddling silently along and straight past me, about ten feet from where I stood. It spotted me and halted, and sat in the water staring at me, giving a series of what seemed like indignant huffs before disappearing under the surface with a loud plop.