18/08/2026
Raven Coyote explained! ❤️🐺
Every black coyote in North America is carrying a gene that did not originate in coyotes. The mutation that turns the coat dark is a three-base-pair deletion in a gene called CBD103, first identified by Anderson and colleagues in a 2009 Science paper. The same deletion produces black coats in domestic dogs, gray wolves, and coyotes. The genetic pattern across all three species points to a single origin: domestic dogs. The mutation entered wild canid populations through interbreeding thousands of years ago. Schweizer and colleagues dated its arrival in Yukon wolves to between 1,598 and 7,248 years ago, consistent with hybridization between early Native American dogs and wild canids.
The mutation did not stay in one species. It moved. Dogs gave it to wolves. Dogs or wolves gave it to coyotes. And in the southeastern United States, the transfer route has a specific and darker history.
Black coyotes are almost exclusively an eastern phenomenon. In western coyote populations, melanism is nearly nonexistent. Only one case was documented in Colorado during the 1920s across an extensive national survey. In the Southeast, melanistic coyotes comprise 5 to 9 percent of surveyed populations. In parts of Georgia, Tennessee, and North Carolina, the figure reaches 10 percent. The Atlanta Coyote Project found two to three black coyotes for every 75 to 100 trapped in southern Georgia. A Louisiana study recorded 5.7 percent. A nine-year Florida study documented nine melanistic individuals, all preferring areas with dense canopy cover and dark bottomland forest where a black coat blends better than a tawny one.
The concentration in the Southeast traces back to the red wolf. Melanistic red wolves once carried the same CBD103 deletion across the forests of the Gulf Coast, the Mississippi River basin, and the southern Appalachians. When the federal government began eradicating red wolves through poisoning, trapping, and shooting campaigns in the 1940s and 1950s, the wolves disappeared. The coyotes moved in along the same routes. But before the red wolves vanished entirely, they had been breeding with the arriving coyotes at the collision zone between the retreating wolf population and the advancing coyote population. The black gene crossed over.
By the 1970s, the remaining 100 to 200 red wolves were confined to a strip of coastal habitat in southeastern Texas and southwestern Louisiana. The U.S. Fish and Wildlife Service captured 17 of them in 1973 to establish a captive breeding program. Every wolf they selected was russet-colored. The melanistic red wolves were already gone. But their gene was not. It was walking north and east inside coyotes that had absorbed it at the contact zone decades earlier and were now spreading it across every state the red wolf had once occupied.
Arthur Halloran of the U.S. Fish and Wildlife Service first documented black coyotes along the same corridor where red wolves were being exterminated. The timing was not coincidence. The coyotes inherited the black coat from the wolves they replaced, and they carried it into territories the wolves could no longer defend.
The CBD103 gene does more than change coat color. It belongs to the beta-defensin family of antimicrobial peptides and plays a role in immune response. Schweizer's team found evidence of positive natural selection on the black allele in multiple wolf populations, suggesting the gene is being retained not because of how it looks but because of what else it does. A black coyote may carry enhanced pathogen resistance alongside its dark fur, selected for invisibility in the dense southeastern forests where it hunts under heavy canopy.
Image is for illustration purposes only
Source: Anderson et al. (2009), Science / Schweizer et al. (2018), Molecular Ecology / Caudill and Caudill (2015) / Hinton et al. (2022), BMC Zoology / Environmental Literacy Council / Deer & Deer Hunting / National Deer Association.
