Coyotes play a surprisingly central role in North American ecosystems, functioning as both predator and scavenger in ways that ripple across entire food webs. In many regions where wolves have been eliminated, coyotes have stepped into the role of top predator, and their presence shapes everything from rodent populations to which plants take root in a forest. Removing them triggers a chain of ecological consequences that can reduce biodiversity and destabilize prey populations.
Keeping Smaller Predators in Check
One of the most significant things coyotes do is suppress populations of smaller predators like red foxes and feral cats. This process, known as mesopredator release, is what happens when a dominant predator disappears: mid-sized predators explode in number, expand into new territory, and put intense pressure on vulnerable prey species like ground-nesting birds, lizards, and small mammals.
Research on coastal barrier islands illustrates this clearly. When coyotes are present, red fox and feral cat activity drops substantially. In one study, the presence of coyotes cut cat habitat use nearly in half, and 75% of camera locations where foxes were absent had coyotes present. The only factor that determined where red foxes showed up on these landscapes was whether coyotes were also there. In areas with low human food subsidies, coyotes’ ability to exclude or kill smaller predators reduced overall predation pressure on threatened species like beach-nesting shorebirds.
This top-down control matters because feral cats and foxes are among the most destructive predators of small wildlife worldwide. By keeping their numbers and movements in check, coyotes indirectly protect species they never interact with directly.
Controlling Rodent and Rabbit Populations
Coyotes are prolific rodent hunters. A large-scale analysis of coyote diets found that rodents were the most commonly consumed prey, appearing in nearly 3,500 dietary records, followed by rabbits and hares at around 950 records. Their diet is remarkably broad, spanning fruit, insects, reptiles, birds, and mammals ranging from field mice to adult moose, but wild mammals form the core of what they eat.
Even within coyote family groups, there’s a division of labor. Juveniles under 18 months feed primarily on small rodents, while adults tend to target larger prey like deer. This means that during the months when young coyotes are learning to hunt, rodent suppression is especially intense.
The practical impact is significant for agriculture. Research has shown that when natural prey like rodents and rabbits are abundant, coyotes are less likely to prey on livestock such as sheep. In other words, coyotes naturally gravitate toward their preferred wild prey. That preference makes them effective, free pest control for farmers dealing with crop-damaging rodents, even as the relationship between coyotes and ranchers remains complicated.
Filling the Gap Where Wolves Are Gone
Across most of the continental United States, wolves have been eliminated. Coyotes have expanded to fill that ecological vacuum, and in many landscapes they now serve as the largest carnivore in the food web. This shift has real structural consequences for ecosystems.
Where wolves and coyotes coexist, as in the greater Yellowstone ecosystem, wolves suppress coyote densities through direct aggression and competition. Coyote populations in wolf territories range from 0.19 to 0.48 per square kilometer, compared to 0.35 to 0.73 in wolf-free areas. Coyotes respond by adjusting their distribution, behavior, and even pack size to avoid conflict. But in the vast majority of North America where wolves are absent, coyotes operate without that check, and they take on the role of regulating prey populations from the top of the food chain.
This doesn’t make coyotes a perfect replacement for wolves. They’re smaller and less capable of controlling large ungulate herds. But they do provide a partial substitute for top-down regulation that would otherwise be entirely absent.
Scavenging and Nutrient Recycling
Coyotes are among the most active scavengers in North American landscapes. In a study of carcass removal in southwestern Montana, coyotes accounted for roughly 22% of all scavenger activity at carcass sites, making them the third most frequent scavenger behind ravens/crows and magpies, and the most active mammalian scavenger recorded.
This cleanup work provides real ecosystem services. Scavenging removes carcasses that would otherwise become breeding grounds for disease-causing bacteria and parasites. It also recycles nutrients back into the food web more efficiently. When scavengers break down a carcass, the nutrients are redistributed through their movements and waste rather than concentrating in one decaying spot. Coyotes are facultative scavengers, meaning they scavenge opportunistically alongside their hunting, which makes them especially effective because they’re active across such a wide range of habitats and seasons.
Spreading Seeds Across the Landscape
A less obvious role coyotes play is seed dispersal. Because they eat large quantities of fruit and berries, viable seeds pass through their digestive systems and get deposited across the landscape in their scat. Research in the Sierra Madre Occidental of Mexico found that coyote scat frequently contained seeds of manzanita and juniper, two pioneer species critical to forest regeneration after disturbance. About 28% of collected coyote scat contained seeds, with individual samples carrying over 200 manzanita seeds or more than 20 juniper seeds.
Coyotes cover enormous distances daily, often several miles, which means they disperse seeds far from parent plants. This is especially important for recolonizing burned or degraded landscapes, where getting seeds into open ground is the bottleneck for recovery. Other carnivores like foxes and bobcats also disperse seeds, but coyotes’ wide-ranging movements and adaptability to different habitats make them particularly effective couriers.
Their Role in Cities and Suburbs
As coyotes have expanded into urban and suburban areas across North America, they’ve brought their ecological services with them. In cities, coyotes function as top predators that help control deer, rodent, and Canada goose populations. Backyards provide abundant prey: mice, rabbits, squirrels, and voles thrive near bird feeders and fruit trees, and coyotes follow.
Urban rodent control is particularly valuable. Mice and rats carry diseases, damage infrastructure, and are expensive to manage through conventional pest control. Coyotes provide that service passively, simply by being present and hunting. Their suppression of feral cat populations in urban green spaces can also benefit songbird populations, creating a cascade of benefits that most city residents never notice.
What Happens When Coyotes Are Removed
Large-scale coyote removal programs offer a window into what ecosystems look like without them. A study across 12 large areas in Wyoming and Utah, each over 10,500 square kilometers, tested what happened when coyotes were intensively removed. Pronghorn antelope fawn survival and abundance increased with more coyotes removed, confirming that coyotes do regulate pronghorn populations through predation on young animals. Mule deer, however, showed no such response, suggesting that coyote predation isn’t a meaningful constraint on all ungulate species.
These results highlight the nuance of coyote ecology. Removal can benefit specific prey populations in the short term, but it comes with costs that are harder to measure: unchecked rodent growth, mesopredator release, loss of scavenging services, and reduced seed dispersal. The full ecological price of removing coyotes from a landscape unfolds over years, not months, and it touches parts of the food web that aren’t always the focus of management decisions.