Orkney Marine Life: Seals, Whales, Dolphins & Orcas Guide

Few coastlines in Britain put you closer to wild marine mammals than Orkney. Twenty-three species have been recorded in these waters — grey seals on every skerry, harbour porpoises rolling through Scapa Flow, named orca pods that pass by on the way from Shetland to Iceland, and a winter pulse of humpbacks that nobody talks about enough. Here's where to look, when to look, and how to do it without disturbing what you came to see.

Orkney's Marine Mammal Residents and Visitors

Over twenty-three species of marine mammals have been recorded in Orkney waters, drawn by nutrient-rich currents and a constant supply of herring, sandeel and seal. The eight you're most likely to encounter:

• Grey Seal (Halichoerus grypus): Orkney is a global stronghold — roughly 10% of the world's grey seals breed here, and the islands produced about 22,150 pups in 2019 alone. Bulls reach 2.6 m, distinguished by the long 'Roman nose' profile and parallel nostrils. White-coated pups arrive between October and December.
• Common (Harbour) Seal (Phoca vitulina): Smaller (up to 1.85 m), dog-faced, V-shaped nostrils. Pups in June–July. Often seen at low tide hauled out in the unmistakable 'banana pose' — head and tail both lifted, belly slumped on the rock. Sadly, Orkney's common seals have collapsed by 85% since 1997 (8,500 down to roughly 1,300) and are still declining at around 10% per year.
• Harbour Porpoise (Phocoena phocoena): The smallest and most common cetacean. Year-round, peaks August–October. Look for the small triangular dorsal fin breaking the surface — Switha Sound regularly draws aggregations of 200+ animals in autumn.
• Risso's Dolphin (Grampus griseus): Robust, blunt-headed, and heavily white-scarred with age. Frequently sighted around Hoxa Head and outer Scapa Flow, peak July–September.
• White-beaked Dolphin (Lagenorhynchus albirostris): Larger and more energetic, often in big pods through summer, especially in Pentland Firth and offshore.
• Minke Whale (Balaenoptera acutorostrata): The most commonly sighted baleen whale, peak June–August on herring. Ferry crossings give you the best vantage.
• Orca (Killer Whale) (Orcinus orca): The apex predator. Sightings peak May–July; named pods including the 27s and 64s pass through regularly, often hunting seals close to shore.
• Humpback Whale (Megaptera novaeangliae): The under-publicised winter visitor — late autumn and early winter sightings have become near-annual in Scapa Flow and Pentland Firth since the WDC Shorewatch programme started recording the trend in 2020.

When to See What — Month by Month

One of the biggest mistakes visitors make is arriving expecting orcas in October or humpbacks in July. Each species has its window. Here's how the year breaks down across the eight species you're most likely to see:

If you're trying to maximise variety on a single trip, June and July are the strongest weeks of the year — orcas peak, minkes arrive, white-beaked pods turn up, and porpoises are everywhere. Late autumn (October–November) is the second sweet spot: peak grey-seal pupping, the porpoise aggregation in Switha Sound, and the start of the humpback season.

Best Places for Seal Spotting

Seals haul out all around Orkney's coast, but a handful of sites are reliable enough that you can build a half-day around them. Always observe from cliff-tops or paths — never approach.

Orkney sits at the heart of the selkie tradition — the seal-folk who shed their skins to walk on land. Spend half an hour watching common seals on a quiet shore and you understand exactly how the legend started.

Top Spots for Whale and Dolphin Watching

Cetacean sightings reward patience and elevation. The trick is to position yourself somewhere with a wide sea view, sit still for at least 30 minutes, and scan slowly through binoculars rather than chasing every splash.

• Coastal headlands: Marwick Head, Mull Head (Deerness), Hoxa Head, Yesnaby Cliffs, and Noup Head on Westray all offer big-sky sea views with elevation. Summer is best.
• Ferry crossings: The Pentland Firth runs (Pentland Ferries Gills Bay–St Margaret's Hope, NorthLink Scrabster–Stromness, Pentland Ferries Burwick–John o' Groats) are genuine cetacean hotspots. Pentland Ferries actively supports OMMRI's research, and crews often point out fins. Bring binoculars and stay on deck.
• Scapa Flow: Hoxa Sound, Switha Sound and the southern entrances regularly produce harbour porpoise, Risso's dolphin, and occasional minke. Read our Scapa Flow guide for context on the geography.
• Tidal races: Strong currents at the Pentland Firth, Eynhallow Sound and the Burra Sound concentrate prey and attract feeding cetaceans.

Orkney's Orcas: Pods, Names and Hunting Behaviour

Orkney is arguably the best place in the UK to see orcas. Three to four pods rotate through these waters between Iceland and Shetland, and the local research community knows almost all of them by sight.

• The 27s pod: Eight known individuals, led by matriarch Vaila with her 2022 calf. Members include adult males Hulk and Nótt, and the powerful male Úlfur. The pod ranges Shetland–Orkney–Faroes–Iceland and was photographed wave-washing seals at St Ninian's Isle in November 2024.
• Hunting behaviour: Orkney orcas specialise in seals — sometimes using sophisticated 'wave washing' to knock seals off skerries, sometimes simply ambushing them at known haul-outs. Sightings often happen within 50 m of shore.
• Identification: Each orca has a unique dorsal-fin shape and saddle-patch pattern. The Sea Watch Foundation, Hebridean Whale and Dolphin Trust and OMMRI maintain a UK photo-ID catalogue.

How to Contribute Sightings

Citizen-science reporting is genuinely valuable here — the local research community is small, and a single timestamped photo from a visitor can identify a known individual or confirm a previously-unrecorded movement. If you see something, report it:

• Orkney Cetacean Sightings (Facebook group): the fastest-moving channel, with locals and researchers active in real time.
• OMMRI — Orkney Marine Mammal Research Initiative: ommri.org accepts sighting reports and photos. They run dedicated porpoise studies in Longhope Bay on Hoy.
• Sea Watch Foundation: seawatchfoundation.org.uk runs UK-wide cetacean monitoring including the annual Orca Watch in late May.
• WDC Shorewatch: if you can spare a watch session at a designated site, the Shorewatch programme has logged over 100,000 watches and a million minutes of survey effort since 2005.

Always include date, time, exact location (lat/long if possible), number of animals, behaviour, and any photos or video — even poor-quality images can be diagnostic.

Decline, Strandings and Why It Matters

It's tempting to talk about Orkney's marine mammals only in superlatives. The full picture is more complicated, and worth a visitor knowing.

• Common seal collapse: the harbour seal population in the North Coast and Orkney Special Management Unit has fallen roughly 85% since 1997 and is still declining at about 10% per year, per the 2024 SCOS report. Cause uncertain — likely a combination of disease, prey shifts and possible orca predation pressure.
• Sanday strandings: on 11 July 2024, 77 long-finned pilot whales stranded at Tresness Beach, Sanday — the largest mass stranding in the UK in nearly a century. A second stranding of 23 pilot whales followed at Roo Beach in August 2025. Investigations continue.
• Grey seals are abundant; that doesn't mean the system is healthy. A booming top predator alongside a collapsing common seal population is a sign of an ecosystem in flux. Wildlife watching here is a privilege — treat it that way.

The Scottish Marine Wildlife Watching Code

Following the SMWWC isn't bureaucratic box-ticking — it directly affects whether the next visitor gets to see what you saw. The headlines:

• Maintain distance: at least 100 m from seals and cetaceans (300 m for whales with calves). Let the animals control the encounter.
• Be predictable: in a boat, no sudden speed or direction changes. Approach slowly from the side, never head-on.
• Limit viewing time: 15–20 minutes maximum per encounter to minimise stress.
• Don't crowd: max three boats around one group of animals.
• Never feed marine mammals.
• Extra caution during pupping seasons: Oct–Dec for greys, Jun–Jul for commons. Keep dogs on leads anywhere near haul-outs.
• No drones over haul-outs or pods. Drone disturbance is a NatureScot offence under the Conservation (Natural Habitats) Regulations.

Frequently Asked Questions

When is the best time to see Orcas in Orkney?

While orcas are recorded year-round, sightings peak between May and August — May, June and July are the strongest months as pods follow seal populations and migrate between Iceland, Shetland and Orkney.

Where is the best place to see seals?

St Mary's Village (Mainland) at low tide is the most reliable spot for common seals in classic banana pose. For grey seals, Widewall Bay (South Ronaldsay) and the Brough of Birsay skerries are dependable year-round, with peak numbers and pups Oct–Dec.

Do I need a boat trip to see whales or dolphins?

Not necessarily — many sightings happen from coastal headlands and ferries. That said, a small-group wildlife charter dramatically increases your chances of close-range porpoise, dolphin and seal encounters and offers a perspective you can't get from a clifftop.

How do I report a marine mammal sighting?

Post to the Orkney Cetacean Sightings Facebook group for fastest pickup, then submit to OMMRI (ommri.org) with the date, location, time, species, number of animals, behaviour and any photos. The Sea Watch Foundation also accepts UK-wide reports.

Are the animals dangerous?

Marine mammals are wild animals and should be treated with respect — never approach, touch or feed them. There is no record of orcas attacking humans in the wild anywhere in the world; the genuine risk is to the animals from human disturbance, not the other way around.

Choose accommodation with a sea view or near coastal paths and you can be watching from your kitchen window before breakfast — for many visitors that turns out to be the most memorable wildlife of the trip.