Is the hooded crow a distinct species or just a grey-clad carrion crow?

Nature · Published 3 October 2026 Swipe more like this →

In short: The hooded crow is a master of identity crises. Once considered a separate species, then reclassified as a subspecies of the carrion crow, its status remains a subject of intense scientific debate. Genetically nearly identical to its all-black cousin, this bird proves that even in nature, appearance is often skin deep.

The hooded crow (Corvus cornix) is a striking bird defined by its ash-grey torso and contrasting black head, wings, and tail. Its classification has shifted repeatedly: separated from the carrion crow in 2002, it was re-merged into a single species by the global AviBase in 2025. This taxonomic instability reflects the birds' complex relationship; they are genetically almost indistinguishable, save for a tiny portion of their genome—less than 0.28%—located on chromosome 18, which dictates the lighter plumage. Despite this, they maintain a clear divide in the wild, engaging in assortative mating where individuals prefer partners that look like themselves.

This behavior creates a narrow, persistent hybrid zone where the two populations meet, such as in northern Britain and Siberia. While they can produce fertile offspring, these hybrids are often less well-adapted than their purebred counterparts, keeping the hybrid zone consistently thin. Scientists believe this distribution pattern stems from Pleistocene glaciation cycles, which split ancestral populations into isolated groups that later re-expanded and made secondary contact. Today, the hooded crow is a highly successful scavenger, known for its intelligence and opportunistic diet, which includes everything from carrion and small mammals to stolen gull eggs.

Beyond biology, the hooded crow is deeply woven into human culture. In Ireland, it appears in myths as a manifestation of the Morrígan, while in Scotland, shepherds once left offerings to protect their flocks. Its historical names, such as the 'Royston crow' of Hertfordshire, reflect its past as a common winter visitor to England. Today, while the IUCN classifies the hooded and carrion crows together as 'least concern' due to their massive combined population of 14 to 34 million individuals in Europe, the hooded crow remains a distinct, recognizable presence across the continent, from the streets of Warsaw to the cliffs of the Faroe Islands.

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