How to Spot Seals and Dolphins from the Shore

Why Our Shores Are Better Than You Think

Britain is ringed by water that is far richer than its grey-green surface suggests. Grey seals haul out on rocky skerries from Cornwall to the Hebrides, common seals favour sheltered estuaries and sandbanks, and bottlenose dolphins patrol big stretches of the Moray Firth, Cardigan Bay and the southwest approaches. Add harbour porpoises, common dolphins, and the occasional minke whale or basking shark in summer, and it becomes clear that some of the best wildlife watching in the country costs nothing and requires no boat at all.

What it does require is patience, a pair of binoculars, and a little knowledge of how animals behave when they surface. Most people who "see nothing" simply look in the wrong place at the wrong time, scanning a flat expanse of sea for a few minutes before giving up. Give it an hour and a method, and your luck changes dramatically.

Read the Water: What to Look For

Dolphins and porpoises rarely leap obligingly from the waves. More often they betray themselves with a small, deliberate disturbance you have to train your eye to catch.

• A splash with nothing above it. If there is no gull, gannet or cormorant in the spot, something below the surface made it.
• Rolling black arcs. A bottlenose dolphin breaks the surface in a smooth, unhurried roll, showing a tall, curved dorsal fin and a broad back, then vanishing for a minute or two.
• A sharp "puff" of spray. Harbour porpoises are small, shy and quick, surfacing with a brief, chuffing breath rather than a splash. Many people hear them before they see them.
• Birds doing the work for you. Diving gannets, a raft of gulls and terns hovering over one patch, or a flock of shearwaters circling usually means fish being driven to the surface, with dolphins underneath.
• A dog-like head above the swell. That is a seal, often just the nose, eyes and crown, peering around before a slow, bottle-shaped slide back under. A seal at rest on its side, in a banana curve, is hauled out and best left alone.

Learn to spot these at a glance and you will start finding animals on almost every coastal walk.

Time It Right: Tides, Weather and the Dawn Advantage

Early mornings are the single best slot in the day. The sea is often calmest before the wind builds, the light is low and angled, and boat traffic is minimal. Seals and dolphins also tend to feed hard around dawn, following fish as they move inshore. Aim to be in position an hour after sunrise if you can manage it.

Beyond the hour, conditions matter enormously. A flat, glassy sea in a light offshore breeze is ideal: every fin and splash stands out. Sea state two or less, with visibility measured in kilometres rather than metres, is what you want. Rising tides are generally the most productive, particularly where they push over shallow reef, sandbanks or a harbour mouth. Spring tides, which run higher and faster, often bring in more fish and more predators.

Seasonally, April to October gives you the best chance of dolphins and porpoises. Seals are present all year, but be careful in autumn, when grey seal cows haul out to give birth on remote beaches and pupping colonies are highly sensitive. If you see a pup alone on a beach, it has almost certainly not been abandoned — the mother is offshore, watching, and human presence will keep her away.

Scanning Like a Professional

Choose height where you can. A headland, a pier end, a breakwater or a cliff path lifts you above the glare on the water and lets you see the shape of a fin rather than just a glint. Avoid looking into the sun, and if the light is coming low across the sea, shift your position or come back when it is behind you.

A pair of 8x42 or 10x42 waterproof binoculars is plenty. Higher magnification is harder to hold steady without a tripod and narrows your field of view, which slows your search. Then work a system:

• Sweep slowly in horizontal bands, starting at the horizon and working towards you.
• Scan with the naked eye first for movement, then use binoculars to confirm.
• Brace your elbows on a wall or set the binoculars on a railing to steady them.
• Pick a promising stretch of water and watch it for at least fifteen minutes before moving on.
• Resist swinging round at every splash. Movement is easier to catch in the corner of your eye if you stay still.

Dolphins often travel, so keep looking fifty to a hundred metres beyond where you last saw them. Porpoises tend to stay put, feeding in a small area, and can be waited out.

Know Your Species

It helps to have a rough field guide in your head. Bottlenose dolphins are large, dark grey, and show a sickle-shaped fin with a concave trailing edge. Common dolphins are smaller and more excitable, often in big groups, with a distinctive hourglass pattern on the flank and a more upright fin. Harbour porpoises are short, stubby and almost beakless, giving a quick, triangular fin and a rolling surfacing that shows no back.

Basking sharks, seen in summer off the west coast, can be mistaken for dolphins at distance, but a basking shark shows a large triangular dorsal fin followed by a second, much bigger tail fin breaking the surface as it cruises slowly along. Seals in the water are broader-headed than dolphins and surface vertically, without a fin.

Keep a Respectful Distance

Wildlife watching only works if the animals stay wild. As a rule of thumb, stay at least 100 metres from seals on shore and around 300 metres from dolphins and porpoises, moving slowly and quietly. Keep dogs on a short lead near hauled-out seals and always give pupping beaches a wide berth.

Watch for the signs that you are too close: a seal raising its head and staring at you, animals changing direction away from the shore, or dolphins diving repeatedly without surfacing to breathe. If that happens, back off and let the sea settle. Report your sightings to a local wildlife recording scheme, which helps build a picture of where these animals live. Then find a comfortable spot, pour a flask of tea, and wait. On a still morning on a good headland, the sea almost always gives something back.