The European mink is vanishing, and its American cousin is not the only culprit.

Nature · Published 3 October 2026 Swipe more like this →

In short: Once widespread across Europe, the European mink is now critically endangered. While the introduced American mink is a major threat, the species' decline is a complex puzzle involving habitat loss, hybridization with polecats, and even the collapse of crayfish populations. Understanding this collapse requires looking beyond simple competition.

The European mink, a semiaquatic mustelid, has suffered a catastrophic population drop of over 90% in the last 150 years. Listed as critically endangered by the IUCN, the species is expected to decline by more than 80% over the next three generations. This downward trend began as early as the 18th century in some regions, long before the American mink was introduced to Europe in the 1920s and 1930s.

Several factors drive this extinction. Habitat destruction, particularly the drainage of small rivers and wetlands, has severely fragmented their range. Additionally, the European mink faces intense pressure from the European polecat. Climate shifts in the early 20th century expanded the polecat's range, leading to increased competition and rare instances of hybridization. These hybrids, known as khonorik, are often larger and more aggressive, further complicating the survival of purebred minks.

The American mink remains a significant factor, however. Beyond direct competition for resources, the American species reproduces earlier. When male American minks mate with female European minks, the resulting embryos are reabsorbed, effectively sterilizing the females for that season. Furthermore, the American mink acts as a vector for diseases like skrjabingylosis, which has been found to infect over 77% of European minks in certain Russian regions. The loss of crayfish, a key food source, has also been linked to the mink's disappearance in specific areas.

Conservation efforts are now underway to reverse these trends. Projects in Estonia, such as the reintroduction of the species to the island of Hiiumaa and the ongoing efforts on Saaremaa, represent a desperate attempt to save the mink from total extirpation. With fossil records suggesting the species may have originated in North America or emerged through recent hybridization, the European mink remains a mysterious and fragile link in the continent's ecosystem.

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