Coyotes are not bad for the environment. In most ecosystems across North America, they function as a top predator that keeps smaller animal populations in check, controls rodent numbers, and helps maintain the balance between species. The perception that coyotes are harmful comes largely from their conflicts with people, pets, and livestock, not from any damage they do to ecosystems themselves.
How Coyotes Regulate Other Predators
One of the most important things coyotes do is suppress populations of smaller predators like red foxes, raccoons, skunks, and feral cats. Ecologists call this “mesopredator release”: when a top predator disappears, these mid-level predators explode in number and can devastate bird nests, reptiles, and small mammals. Coyotes prevent that from happening.
Research on barrier island ecosystems found that the single biggest factor determining where red foxes lived was whether coyotes were present. Free-ranging domestic cats showed the same pattern. Where coyotes moved in, these smaller predators pulled back. That matters because feral and free-roaming cats alone kill billions of birds and small mammals each year in the United States. By keeping cat and fox numbers lower, coyotes indirectly protect songbirds, ground-nesting species, and other vulnerable wildlife.
Rodent Control and Agricultural Benefits
A single coyote can consume over 1,000 rodents in a year. That includes mice, voles, gophers, and rats, many of which are agricultural pests that damage crops, contaminate grain stores, and burrow through fields. For farmers, coyotes provide a form of free, ongoing pest control that no amount of trapping or poison fully replaces. Removing coyotes from an area often triggers a boom in rodent populations, which can cause more economic damage than the coyotes themselves.
The Complicated Link to Lyme Disease
The relationship between coyotes and tick-borne disease is one area where the ecological picture gets more complex. Red foxes are aggressive hunters that stockpile prey, killing more rodents than they need and caching the rest. Coyotes, by contrast, hunt only when hungry and don’t store extra kills. So in areas where coyotes have displaced red foxes, populations of mice and other small mammals can actually increase. Since these rodents are the primary hosts for the ticks that carry Lyme disease, regions with thriving coyote populations and declining fox populations have seen higher infection rates in ticks.
This doesn’t mean coyotes “cause” Lyme disease. It means their presence reshuffles predator dynamics in ways that can have unintended consequences for one specific disease cycle. The broader rodent control they provide still has net benefits, but it’s a reminder that ecosystems rarely have simple good-or-bad answers.
Native Species, Not Invasive
Coyotes are native to North America. Their range has expanded dramatically over the past century, moving from the prairies and deserts of the West into every U.S. state, most of Canada, and increasingly into Central America. This expansion was driven largely by human activity: the extermination of wolves removed their main competitor, and widespread deforestation and agriculture created open habitats they thrive in.
Some people assume that because coyotes now live in places they didn’t historically occupy, they must be invasive. Biologists draw a distinction here. Invasive species are introduced from outside their native continent or ecosystem, often by human transport. Coyotes spread on their own four legs into adjacent territory, responding to ecological changes humans created. Their expansion blurs the line between native range shift and invasion, but they are not classified as an invasive species.
Eastern Coyotes Are Part Wolf
Coyotes in the eastern United States are genetically distinct from their western relatives. As coyotes moved east, they hybridized with wolves, producing animals that are larger, have wider skulls, and are better at hunting deer. Genetic analysis shows that eastern coyotes carry roughly 31% wolf DNA on average, with some individuals being much more wolf-like than others. About 10% of their genome traces to domestic dogs.
This hybridization has ecological significance. In areas with high deer density, the more wolf-like coyotes tend to thrive because they’re better equipped to take down larger prey. Northeastern coyotes eat substantially more deer than their western counterparts. In overpopulated deer herds, where overbrowsing strips forests of their understory and damages tree regeneration, this predation pressure is a genuine ecological benefit. Eastern coyotes partially fill the role that wolves once played before being hunted out of the region.
What Urban Coyotes Actually Eat
City-dwelling coyotes have a remarkably varied diet. A DNA analysis of coyote scat in New York City found that 80% of samples contained plant material, about 35% contained small mammals, 34% contained insects, and 27% contained birds. White-tailed deer showed up in fewer than 10% of urban samples.
Anthropogenic food (garbage, pet food, compost, and other human-related sources) appeared in 64% of urban coyote samples. That number was similar for non-urban coyotes at about 55%, suggesting that even suburban and rural coyotes scavenge human food when it’s available. Urban coyotes actually had a more species-rich diet overall, eating a wider variety of prey than their rural counterparts. They consumed more plants and insects but fewer deer and large mammals. In cities, coyotes function as generalist scavengers and rodent hunters rather than apex predators.
Conflicts With People Are Real but Rare
Between 1977 and 2015, researchers documented 367 coyote attacks on humans across the United States and Canada. For context, that’s roughly 10 per year across an entire continent with hundreds of millions of people and millions of coyotes. Attacks did increase over time, particularly in southern California, where reported incidents rose from 31 during 1990 to 1997 to 50 during 1998 to 2005. Only two fatal coyote attacks on humans have ever been recorded in North America.
The driving factor behind nearly all aggressive encounters is food conditioning. In Canadian urban areas, food conditioning was identified as a direct or indirect factor in 100% of coyote attacks studied. In U.S. national parks, parks where visitors intentionally fed coyotes reported far more aggressive coyote behavior than parks where feeding didn’t occur. Many attacks also go unreported: in 2015, at least 13 people were bitten by coyotes in Los Angeles, but only one incident made the news.
These conflicts are a human management problem, not an environmental one. Coyotes that lose their fear of people because of easy food access behave differently from wild coyotes that maintain natural wariness. Securing garbage, not leaving pet food outside, and never deliberately feeding coyotes are the most effective ways to prevent these encounters.
The Net Ecological Balance
Coyotes occupy a niche that would otherwise sit empty across much of North America. With wolves eliminated from over 95% of their historic range in the lower 48 states, coyotes are the largest predator left in most landscapes. They suppress populations of smaller predators that would otherwise overwhelm ground-nesting birds and small wildlife. They consume enormous numbers of rodents. In the East, their wolf-hybrid genetics allow them to help manage deer herds that damage forests when left unchecked.
The costs they impose, occasional livestock losses, rare conflicts with people, and a possible indirect effect on Lyme disease dynamics, are real but limited compared to the ecological services they provide. Removing coyotes from a landscape consistently produces cascading problems: rodent booms, feral cat proliferation, nest predation spikes, and overbrowsing by deer. Decades of intensive coyote removal programs have also shown that their populations bounce back quickly, with females producing larger litters when numbers drop. The ecosystem, in effect, keeps pulling them back because it needs them.