Why Moulting Penguins Need Space at Boulders Beach

Picture the boardwalk at Boulders on a warm morning. Most of the birds look sleek and busy. One stands apart, its feathers sticking out like an old coat, and it does not move when you lean over the rail. Many visitors think it is sick, or lazy, or friendly. It is none of these. It is moulting. So why do moulting penguins at Boulders Beach need space? Because for a few weeks the bird cannot swim or feed, and every bit of energy it spends on worry comes out of a fat store it cannot refill until it is waterproof again.

Boulders Beach, in Simon's Town, is part of Table Mountain National Park. One source says the colony began in 1983, when a pair was seen on Foxy Beach. South Africa’s national management plan for the species says it grew with birds from nearby island colonies to around 3,900 birds in 2005, and the Simon’s Town colonies, which include Boulders, held 975 breeding pairs in the 2021 census. Today’s estimates vary by source, so I will not give you one exact number. What is certain is that people and penguins share a small piece of coast, and that SANParks manages access with boardwalks and an information centre.

What moulting actually is

Once a year, an adult African penguin replaces all of its feathers. In the sea, the feathers hold a thin layer of air against the body, and this keeps the bird warm and waterproof. That layer wears out, so the coat has to be renewed. And it does not happen slowly, a few feathers at a time. The national management plan calls the penguin moult "catastrophic": the birds replace all their feathers in a relatively short period of 13 to 40 days.

Other sources give similar numbers. A 2025 study in the journal Ostrich is reported to describe a moult of about 21 days, and an older zoo factsheet says about 18 days. While the new feathers grow, the plan explains, penguins are unable to forage at sea. So they fast, and they live on the fat they stored before.

A bird that cannot go for lunch

Think about that for a moment. The penguin stands next to the ocean, where all its food is, and it cannot go in.

According to the management plan, the whole cycle, with the weeks of feeding before the moult and the weeks of recovery after it, lasts about 100 days, with roughly 40 days on each side of the moult itself. Estimates of the body mass lost go from about 40 per cent to nearly half, depending on the source. A bird that starts its moult without enough reserves to finish it and return to the sea is likely to starve.

When is the moulting season at Boulders Beach?

Not in a way anyone can promise. The management plan says that in South Africa the moult is somewhat synchronous, with birds of all ages moulting in early summer, from September to January. A Cape Town visitor guide that reproduces park information puts the peak between October and December. But small numbers of moulting birds are seen all year, and every bird has its own timing.

So please do not plan a trip around seeing a moulting bird. The better rule is this: if you see a penguin in a thick, dull, scruffy coat, treat it as a fasting animal and let it be.

Boulders Beach moulting penguins: what your distance protects

A moulting penguin looks like it is resting, but it is living on stored fat. If it is startled, it uses energy it cannot replace until it swims again. The moult is already risky without any visitors. A study reported in December 2025 found that about 62,000 penguins died between 2004 and 2011, mostly around Dassen and Robben islands, linked to food shortage around the moult. Some reports round the number to 60,000, so I will only say that it was very large.

Is it proven that visitors cause stress? The honest answer is that the science is mixed. A 2022 study in Conservation Physiology measured stress hormones in African penguin chicks at Robben Island and Stony Point, not at Boulders. Chicks with low and rare human presence had higher levels than chicks with medium or high presence, and the authors suggest the chicks may get used to frequent people. That study is about chicks, not moulting adults, and a University of Pretoria release described the risk more strongly.

For me, this does not mean crowds are fine. It means the effect probably depends on how, and how often, we disturb a bird. A fasting adult cannot escape to the sea, so the sensible rule is a simple one: if the animal has to move because of you, you are too close.

What the rules say, and what I could not confirm

SANParks asks visitors to stay on the boardwalks at all times in the viewing area. The boardwalks were built so that people can watch the birds while keeping them safe. It also asks visitors not to touch or feed the penguins, and warns that their beaks are sharp and they will nip if they feel threatened. In its own words, visitors should give penguins "the space they need". BirdLife South Africa notes that nesting areas are fenced. There is an entry fee and opening hours that change by season, so check the SANParks page before you go.

Drones are a different matter. SANParks has said that flying drones is not permitted in any national park, citing the NEMA Protected Areas Act, and it names stress for wildlife as one reason. Boulders is inside Table Mountain National Park, so I would assume no drone. I did not find a page specific to Boulders, and different sources quote different minimum altitudes, so please check the current rule with the park.

Swimming is allowed on the beaches. SANParks lists swimming among the activities at Boulders and calls the cove ideal for children, sheltered from currents, wind and large waves, but its visitor brochure also notes that there are no lifeguards on duty. The penguins are best watched from the boardwalks at Foxy Beach. Kayaks, boats and other vessels may not approach the beach, and Boulders is a "No Take" zone inside the Table Mountain National Park Marine Protected Area, so no shells, sand or marine life leave with you. A CapeTourism FAQ says swimming with the penguins is not permitted, and that is the right spirit: never swim toward a bird, and give any penguin in the water a wide space.

Dogs are excluded from the beaches. The SANParks brochure says they are allowed only on Willis Walk, on a leash. The same brochure asks visitors not to use selfie sticks through fences or near penguins, and to avoid the nesting areas. Rules change, so check the current rule before you travel.

Conservation: why every bird counts now

The management plan shows how fast the numbers have fallen. More than 50,000 pairs of African penguins bred in South Africa in 2004. By 2021 this had dropped to about 10,400 pairs. In October 2024 the IUCN moved the African penguin from Endangered to Critically Endangered. Conservation groups reported fewer than 10,000 breeding pairs left in the wild, and one South African newspaper gave about 8,500. Reports say it is the first of the world's 18 penguin species to reach that category.

SANParks has described the Simon’s Town colony as one of the few in the country with a stable population, while the species declines across South Africa because of food shortages linked to climate change and overfishing. Birds from the colony tagged during breeding travelled up to 37 km across False Bay to find food for their chicks. Penguins and purse-seine fishing compete for sardines and anchovies, and this is a debated topic in South Africa that I am not the person to settle. But it explains why a calm visit matters: the colony has little spare energy to lose.

A kind visit, in real life

Stay on the timber path, and keep your voice low. Use the zoom on your phone instead of your feet, and leave the flash off. We explain why in our piece on leaving the flash off around marine wildlife. Do not pick up a chick, and do not put a towel or a bag next to a bird for a photo. On the beaches where people and penguins share the sand, leave a bird’s path to the water open, and never block its way back to its nest. Never touch. Our guide to why touching marine animals harms them explains the reasons.

In summer the Cape can be hot and windy. A refillable water bottle and a mineral sunscreen are simple, useful things for a beach morning, and a roll-top dry bag keeps a phone and a towel away from sand and spray. You need none of them to see a penguin. The best thing to bring is patience.

Read more about the region in the South Africa Atlas. The same rule we use around nesting turtles applies here, and the same rule we use with seals, as in our note on keeping your distance from seals in Namibia.

Wildlife encounters are unpredictable. Penguin watching should always follow local regulations and experienced professional guidance.

What I take from Boulders

Ocean Calling does not run a trip at Boulders, and I am not selling one. I write about it because the idea travels to every coast we care about: a wild animal is not a prop, and it does not owe us a closer look. Travel also has a cost. A long flight to Cape Town is a real footprint, so if you go, stay longer, move slowly, and make the visit count.

If this made you curious about experiencing the ocean with us, you can explore our small-group retreats, where every guest may skip any activity and no animal is chased, touched or baited.

Questions people ask

Wildlife encounters are never guaranteed and never forced. Ocean Calling works only with vetted, ethical local operators, and every animal is free to approach, or not, entirely on its own terms.