Natural Causes:
* Old age: Squirrels typically live for 5-10 years in the wild, but some can live longer.
* Disease: Squirrels can be susceptible to various diseases, such as rabies, distemper, and squirrel pox.
* Parasites: Internal and external parasites can weaken and kill squirrels.
* Starvation: During harsh winters or periods of food scarcity, squirrels may starve.
Predation:
* Hawks, owls, and other birds of prey: These predators hunt squirrels from the air.
* Coyotes, foxes, and bobcats: These predators hunt squirrels on the ground.
* Snakes: Some snakes, like garter snakes, are known to prey on baby squirrels.
* Domestic cats: Outdoor cats can be a significant threat to squirrels.
Human-Related Causes:
* Cars: Squirrels are often killed by cars, especially in urban areas.
* Poison: Rodenticides intended for other pests can accidentally kill squirrels.
* Trapping: Squirrels may be trapped and killed for various reasons, including population control or fur trade.
* Habitat loss: Development and deforestation can reduce squirrel habitat and make them vulnerable.
Other Causes:
* Accidents: Squirrels can fall from heights, become entangled in objects, or suffer other accidents.
* Extreme weather: Squirrels can succumb to severe cold or heat.
It's important to remember that squirrels are a vital part of the ecosystem and play a role in seed dispersal and pollination. If you encounter a sick or injured squirrel, it's best to contact a wildlife rehabilitator for assistance.