California wolf populations show signs of inbreeding, officials say

The first documented case of inbreeding occurred in 2026 with the Ashpan Pack. A female gray wolf, WHA29F (CA124), born in 2024 to the Whaleback Pack, had five pups with male wolf WHA07M (CA051), a black wolf born in 2021 also from the Whaleback Pack. The Ice Cave Pack represents a second confirmed instance of this phenomenon.

Data from the California Department of Fish and Wildlife (CDFW), compiled under the “California’s Known Wolves” initiative, corroborates these findings, identifying inbreeding within the Beyem Seyo and Ashcan packs as well.

Despite the occurrence, CDFW gray wolf expert Axel Hunnicutt doesn’t view the situation as an immediate threat to the overall health of the wolf population. “At this point, I would not characterize inbreeding as an immediate threat to the viability of California’s wolf population,” she stated.

Hunnicutt explained that California’s wolf population remains connected to a larger western population and continues to receive genetic diversity through wolves dispersing from Oregon and breeding with animals from different lineages. “We continue to document that gene flow annually,” she added.

Inbreeding is uncommon among wolves but can occur in small, isolated groups, a pattern observed in other species like cheetahs, who have faced extinction events leading to reduced genetic diversity, according to National Geographic.