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By the mid-1980s, the California condor had reached a point where conservationists were no longer willing to leave the species’ survival to chance in the wild. Decades of steep population declines forced an unprecedented decision: capturing every remaining individual to build a captive-breeding safety net. What followed became one of the most intensive species-recovery programmes in North American history.
The decision came after a decades-long decline in the California condor population. The species was declared endangered by the U.S. Fish and Wildlife Service in 1967, and by 1982, the wild population had dwindled to just 22 birds. To save the species, wildlife authorities progressively captured the remaining wild individuals between 1982 and 1987.
What followed was one of the most intensive species-recovery programmes in North America. Beginning in California in 1992, captive breeding eventually produced enough birds for reintroduction. But returning the condors to the wild revealed that increasing their numbers was only one part of the challenge. A major threat remained in the landscape itself, that is, lead contamination from ammunition.
The last wild condor was captured in 1987
This emergency intervention capped off on April 19, 1987, when a seven-year-old male identified as AC-9 was captured in the Bitter Creek National Wildlife Refuge. As the final wild condor was brought in, he joined 26 others housed at the San Diego Wild Animal Park and the Los Angeles Zoo. Under tight human care, these 27 surviving birds represented the absolute baseline of a species on the brink of extinction.
Thereafter, the programme focused on the breeding of birds in captivity, while simultaneously preserving genetic diversity and devising means to release them back into the wild. The first of the captive-bred condors were freed in California in 1992. Another group of condors was released in Arizona in 1996; meanwhile, other groups were released further south to Baja California, Mexico.
However, there was a significant breakthrough with the birth of the first chick in 2004 in the wild as part of the current conservation programme. By 2008, more condors were living in the wild compared to those kept in captivity. Though the increasing numbers of wild condors also brought forward an obstacle which could not be solved through captive breeding alone.
The birds returned to a landscape still contaminated with lead
As California condors are scavengers, they consume pieces of lead ammunition while eating the remains of carcasses left by hunters. This lead poisoning can become so severe that the condors require intensive medical treatment or die.
A study published in Proceedings of the National Academy of Sciences analyzed data on the population demographics and lead poisoning among California condors during the years 1982–2010. The findings suggested that despite the captive breeding program and reintroduction efforts, the species still suffers from lead poisoning, and that this problem is a major challenge to their recovery. The estimates showed that up to 20% of free-ranging California condors have elevated blood lead concentrations that require chelation treatment each year. Between 1997 and 2010, reportedly 48% of 184 free-flying California condors in the California population reached the level of lead concentration requiring treatment.
Furthermore, researchers relied on lead isotope data to prove that lead-based ammunition was the primary source of contamination. This data explained a troubling paradox: while captive breeding successfully replaced dying birds, scientists alone could not stop environmental lead contamination at its source. Addressing the root cause required a shift from wildlife management to legislative intervention.
California moved toward removing lead ammunition
State policies were amended to align with the science and conservation. California had already banned lead ammunition in the condor habitat through the Ridley-Tree Condor Preservation Act of 2007. In 2013, the state adopted Assembly Bill 711, mandating that nonlead ammunition must be used for taking wildlife with firearms in the entire state. The bill took effect on July 1, 2019.
The adoption did not automatically erase the threat of lead exposure. Spent ammunition and contaminated carcasses remained scattered across the landscape, forcing recovery teams to expand their field operations. To counter this, the U.S. Fish and Wildlife Service structured an ongoing recovery framework that includes routine health exams, blood testing, GPS tracking, and managed feeding stations across wild condor ranges.
The ongoing challenge shows in the current mortality figures. The Fish and Wildlife Service’s 2024 population report cited lead poisoning as the leading cause of death in free-flying condors from 1992 to 2024, with 151 cases, or 49% of total deaths with known causes in this dataset.
The recovery has also expanded the condor’s range
With the advancement of the project, conservationists have been reintroducing condors into regions of their historical range from which they have been extinct for many years. This is one of the latest and most important projects carried out by the Yurok Tribe in collaboration with the Redwood National and State Parks. The project kicked off in 2008, and on May 3, 2022, for the first time in a hundred years, the California condors were introduced to the ancestral lands of the Yurok Tribe and Redwood National and State Parks. Later in the same year, more birds were introduced as part of the Northern California Condor Restoration Project.
Recovery on a larger scale has brought about astounding demographic changes. According to the U.S. Fish and Wildlife Service’s 2024 annual population status report, 566 California condors were alive by the end of 2024, of which 369 were free-flying and 197 were in captivity. This is a significant shift from 27 captive condors when the last one was captured in 1987.
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