A coastline built for seals

Britain is one of the finest places on earth to watch seals. Two species share our shores: the grey seal, big, long-faced and Roman-nosed, and the smaller, rounder-headed harbour seal, still often called the common seal even though there is nothing common about it. Close to 40 per cent of the world's grey seals breed around our coast, and our islands hold a serious share of Europe's harbour seals too. The happy consequence is that seal watching rarely needs a boat, a permit or a trip to the far north. A clifftop path, a decent pair of binoculars and an hour of patience will usually do the job.

Timing your visit: tides, seasons and the early start

Seals haul out to rest and digest, not to socialise, so they follow the tide rather than the clock. On sandy estuaries and beaches, the best gatherings appear in the two or three hours either side of low water, when sandbanks and mudflats break the surface. On rocky coasts and offshore skerries, tide matters less, but weather matters a great deal: a flat calm morning will always beat a blustery afternoon.

Early morning is the golden window. Fewer walkers, fewer dogs, softer light and stiller air. Seals are also noticeably more relaxed when they have not already been disturbed once that day.

Season shapes what you see. Grey seal pupping runs roughly from September to December, peaking in October and November along the east coast and later in the north and west. Harbour seals pup in June and July, often on sheltered sandbanks and skerries. Breeding season brings spectacular numbers, but also far more sensitive animals, closed paths and volunteer wardens. Late spring and summer remain excellent for watching moulting adults loafing in the sun.

Five stretches of coast worth planning a trip around

• North Norfolk — the sand spits and dunes around Blakeney, Horsey and Winterton hold one of England's largest grey seal colonies. Boat trips run from the quays in season and give you a proper sideways view of the colony without landing near it.
• Lincolnshire — the dunes and sandflats near Donna Nook become a nursery each November and December, with viewing areas, roped paths and wardens on hand. Nowhere else in England offers such close, well-managed viewing of mothers and white-coated pups.
• Northumberland — the rocky islands and reefs off the Farne Islands and the coast around Bamburgh hold grey seals all year. Summer boat trips out of the nearby harbour are reliable, but the clifftop walk south towards Craster is just as rewarding on a calm morning.
• Pembrokeshire — the cliffs and offshore islands of the Marloes peninsula and Ramsey Sound host grey seals, with autumn pupping in sea caves that few people ever see. Look for animals bottling in the tide races.
• Scotland's north and east — the Moray Firth, the skerries of Loch Fleet in Sutherland and the low shores of Orkney all hold strong harbour seal populations, while remote western beaches and islands shelter grey seals. Otters, divers and eagles come free with the ticket.

Reading the shore like a watcher

Half the skill is knowing what to scan. Train your binoculars on anything that might be a rock and wait — a hauled-out seal will eventually lift its head and tail into the classic banana pose, or flipper-wave lazily at the sky. In the water, watch for bottling: an animal resting vertically with only its nose above the surface, which looks unnervingly like a floating bottle or a dark buoy. A distant snort or a low moan carries a long way on still air.

Telling the two species apart gets easier with practice. Grey seals have a long, sloping snout and parallel nostrils set well apart. Harbour seals have a shorter, rounder head and nostrils that meet in a V. If you find a fluffy white pup on a beach in autumn or winter, that is a grey seal, and it cannot swim for its first few weeks — which is precisely why it is on dry land.

How to watch without disturbing

• Stay at least 100 metres away, and considerably further at pupping sites. Use a clifftop path or raised viewpoint instead of walking along the beach.
• Carry binoculars rather than creeping closer. The whole pleasure is watching animals that do not know you are there.
• Never approach a pup. Mothers regularly leave pups while they feed offshore, and a human presence can break that bond for good.
• Keep dogs on a short lead and well back from the haul-out. A single loose dog can empty a colony in seconds.
• Leave the drone at home. Seals react badly to the noise, and in Britain it is an offence to intentionally or recklessly disturb them at a haul-out site.
• If heads start going up and animals shuffle towards the water, you are too close. Back away quietly and slowly.
• If a seal or pup genuinely looks injured or entangled, keep your distance and call a local wildlife trust or marine mammal rescue group.

Practical kit and trip notes

Pack 8x42 binoculars at minimum, and a spotting scope if you have one. Add waterproofs, a windproof layer, wellies and a flask. Check a local tide table the night before rather than relying on an app with no signal, and tell someone where you are going — many of the best seal coasts have patchy mobile coverage. Bring a notebook; noting times, tides and conditions is how you turn a lucky sighting into a reliable one.

Do that, and the reward is quietly spectacular: an early start, a cold bench on a clifftop, and a hundred grey shapes below you, stirring in the first of the light.