In South Africa, 62,000 Penguins Perished in a Decade: The Once-Bustling Beaches Now Echo with a Piercing Silence

On some beaches in southern Africa, bird calls have stopped. Where tens of thousands of mouthpieces once resonated, silence gradually settled in. This sudden decline, almost invisible to the naked eye, does not concern just any species. African penguins, familiar symbols of the Cape coast, are disappearing by the thousands without warning. This decline, discreet but massive, tells much more than an isolated crisis.

A once-thriving population on the verge of extinction

Twenty years ago, African penguin colonies still thrived on the Cape coast. In 2001, almost 56,000 pairs nested in South Africa. At that time, Robben Island and Dassen Island alone had over 30,000 breeding individuals. But between 2004 and 2011, nearly 95% of the birds that attempted to breed on these two islands perished. This gradual disappearance, spread over eight years, occurred in relative silence. No beach littered with corpses, no brutal phenomenon. Simply, adults who have never returned from the sea.

The decline was so severe that the International Union for Conservation of Nature eventually classified the species as “critically endangered” in 2024. Fewer than 10,000 pairs are known today. The study published in Ostrich in December 2025 shows that this dramatic fall cannot be attributed to a single event, but results from a prolonged collapse in food availability in traditional feeding areas.

The invisible threshold beyond which African penguins no longer survive

The drama plays out around a number: 25%. This is the critical threshold identified by researchers below which the biomass of sardines (the main food of African penguins) no longer allows these birds to survive. However, this limit was crossed in 2004 in the waters west of Cape Agulhas. For twelve consecutive years, the stock of sardines remained below this threshold, even reaching a historic low of 91,000 tonnes in 2018.

Unlike other seabirds, African penguins face a period of extreme vulnerability every year. When molting, they fast on dry land for 21 days without being able to hunt. They must therefore store enough fat beforehand. If sardines become rare, these birds simply cannot build up the necessary reserves. Many die before the end of the cycle. Others, weakened, are unable to regain their physical condition after molting.

According to researchers from the University of Exeter, cited by ScienceAlert, this physiological dependence has transformed a simple lack of fish into a lethal spiral. The mathematical models developed in the study make it possible to estimate that 62,000 adults died of starvation between 2004 and 2011, on the two main islands alone. The link between mortality and the collapse of the sardine biomass is no longer debated in the scientific community.

The current limits of conservation policies in the face of climate realities

Faced with this collapse, the South African authorities tried to react. In 2023, no-take fishing zones were established around the six largest penguin colonies. These bans aim to protect critical feeding areas during sensitive breeding and moulting periods. But as Eurekalert reports, these measures remain very limited in their spatial scope and are struggling to reverse the trend.

The study underlines that these sanctuaries represent only one part of a system which remains insufficient. The climate redistributes fish stocks, shifts sardine spawning areas and weakens local balances. Even in the absence of fishing, if ocean currents modify the distribution of prey, colonies find themselves deprived of resources. A more dynamic and adaptive approach to fisheries management, taking into account environmental fluctuations, is considered essential by the authors.

The situation of African penguins implicitly reveals the limits of conservation strategies focused solely on human variables. Protecting a marine species is no longer enough to prohibit fishing around its nest. We must now understand the rhythms of the ocean, anticipate systemic imbalances and admit that beyond a certain point, restoring a population is no longer just a question of protection, but of overall resilience. In a world where sardines are deserting, coastal predators are leaving the void.