Otter signs on a riverbank walk
You may never see an otter. Tracks, spraint and a slide on the bank are the sighting most walkers actually get.
An otter is mostly a rumour with whiskers. Walkers who live beside good rivers can go years without a clear view, then meet one at a bend for three seconds. The reliable pleasure is the evidence: a footprint in silt, a twist of droppings on a stone, a smoothed slide on a steep bank. Learning those signs makes a river walk richer even on the many days when the animal itself is elsewhere, asleep, or simply better at this than you are.
The dropping on the stone
Spraint is the polite word for otter droppings, and otters leave it in obvious places: a flat rock in the water, a ledge under a bridge, a tussock where two ditches meet. Fresh spraint is dark and often contains fish bones, scales or the pink remains of a crayfish. The smell is the confirmation people mention, a musky sweetness that is not the same as a fox or a dog. You do not need to pick it up to notice it. Crouch, look, and leave it where it was put. It is a message to other otters, not a specimen.
If you are unsure, photograph it and the site, and compare later with a reliable field guide. Guessing in the moment is less important than not treading the sign into the mud.
Feet, tails and the soft edge
An otter print shows five toes, though one may fail to mark, and a large rear foot relative to the animal's reputation for being sleek. Dog prints are four-toed and usually accompanied by the rest of the dog, which is also on the path. In soft mud under a bridge, look for a line of prints and, sometimes, a groove where the tail dragged.
The best mud is the mud you can see from the path. Stepping down onto a soft bank to find a better print is how you destroy the print and the bank. After heavy rain the silt is fresh and the signs are new, and the edge is also least stable. Look from the bridge.
Slides, holts and the wish to wait
A slide is a smooth, muddy chute from grass to water, often used more than once. It can mean otters, and it can mean playful dogs or children. Context helps: spraint nearby, a quiet stretch, prints at the bottom. Enjoy the possibility. Do not camp out above it.
A holt is a resting place, in roots, a culvert, a tangle of brash or a hole in the bank. You should not poke, wait at the entrance, or let a dog investigate. Disturbance at a holt is the opposite of a wildlife walk. If you think you have found one, note the place privately, back off, and carry on. Reporting a casual holt to a local mammal group is reasonable. Turning it into a viewing spot is not.
Otters are more widely present on British rivers than they were in the late twentieth century. That recovery does not make them common to see. Dawn, dusk and a quiet bend are your best odds, and even then the odds are modest. The same quiet that helps with deer at a field edge helps here, with the added discipline of watching the water rather than the hedge.
Dogs, banks and other people's fish
A dog in the river on an otter stretch is a splash, a scent and a disturbance you cannot undo. Keep the lead on where signs ask, and on narrow banks anyway. Anglers and otters share water without always sharing a mood. Pass behind a fisher, keep your voice down, and do not assume a glimpse of a brown back in the pool is yours to flush for a better look.
Mink, a smaller non-native animal, also use riverbanks and can be mistaken for a young otter at a glance. Size, face and the company of a reliable guide will sort them later. In the moment, both deserve the same space.
Making the signs part of the day
You do not need a survey. A note in the same book you use for flowers, with the bridge name and what you saw, builds a private map of a river. Over a year you will learn which ledges are used and which bends are only pretty. That knowledge stays light if you keep it as looking, not as a stakeout.
Pair the search with an ordinary walk that would have been worth doing anyway. A heron, a kingfisher and a set of prints is a complete morning. An empty ledge is still a morning by the water. Slow walking is the pace at which spraint stops being a brown smear and becomes a sentence.
Frequently asked questions
What should I do if I see an otter?
Stay still, keep the dog with you, and watch. Do not follow it along the bank. When it goes, let it go. A few seconds is a real sighting.
Are otter numbers high enough that I need not worry?
Wider presence is not the same as being unbothered. One dog at a holt is still disturbance. Walk as if the animal is scarce, and you will not be far wrong in your manners.
Can I bring children on a sign hunt?
Yes. Give them the bridge to inspect and the rule that nothing is poked or pocketed. They are often better at seeing the print than the adult who is looking at the view.