* Owl species: Different owl species have different sizes and hunting strategies. For example, a Great Horned Owl might eat 3-4 mice a night, while a Barn Owl could consume 5-10 mice.
* Availability of prey: If there are plenty of mice around, owls will eat more. If prey is scarce, they might eat less.
* Time of year: Owls need more food during breeding season to feed themselves and their young.
* Individual owl: Even owls of the same species can vary in their hunting habits.
On average, most owls eat 1-3 mice per night. However, some owls might eat more or less depending on the factors mentioned above.
It's important to note that owls also eat other small animals besides mice, including voles, shrews, rats, and even small birds.