Last updated on May 29th, 2023 at 12:02 am
Some birds lay eggs whether or not they are fertilized, but what about owls? Do they need a mate to lay eggs? And do they reproduce sexually or asexually?
Owls do not lay eggs without a mate. If an owl doesn’t have a mate, its ovaries will shrink, and the eggs will not develop. Only in the presence of a courting male will a female have the opportunity to develop full-fledged eggs. Owls are unlike domesticated chickens in this way.
Why Owls Cannot Lay Eggs Without a Mate
Owls cannot lay eggs without a mate because the eggs are fertilized within the ovary before developing a shell and being laid.
A male bird attracts a female with mating calls and displays, and then once the female selects a mate, the pair chooses a nesting location and begins the process of reproduction.
How Do Owls Fertilize Their Eggs?
Owls fertilize their eggs through sexual copulation. The male offers food to the female, and she will accept if she is open to reproduction.
The pair then preens each other and perch closely together. Then, the male mounts the female and begins copulation, which results in fertilization.
Will an Owl Lay Unfertilized Eggs?
An owl will not lay unfertilized eggs. Rather, the ovaries shrink when not used, and the eggs will not develop significant size or shell without being fertilized.
In general, wild birds are unlike domesticated chickens in this way. Minimizing egg production allows them to save precious energy.
How Many Eggs Does an Owl Lay Per Clutch?
Owls usually lay three or four eggs per clutch, though the number varies depending on species.
Some owls will lay as many as 13 eggs at once, whereas some, like the Great Horned Owl, may lay only two.
The number of eggs in a given clutch will also vary depending on how much food is available.
Interestingly, even when owl eggs are laid on the same day, the eggs will not necessarily hatch simultaneously. Owls are unlike geese and ducks in this way.
Eggs may even hatch several days apart from each other.
The only exception to this rule is the Pygmy Owl, whose eggs do hatch all at once.
Typically, the owls that hatch first have a greater chance of survival than those that hatch later.
This is advantageous for the species because it ensures that at least one offspring will survive even in times of scarcity.
If the food were to be distributed among all the young during times of scarcity, they might all starve.
To learn more about the hatching process, we wrote this article on what happens after baby birds hatch.
Do Owls Lay More Than One Brood in a Breeding Season?
Owls lay just one brood per breeding season in most cases, although there are a few exceptions to the rule.
The Barn Owl, Short-eared Owl, and Long-eared Owl are owl species that occasionally raise two broods in one season rather than just one brood.
Where Do Owls Lay Their Eggs?
Owls lay their eggs in tree cavities, on piles of owl pellets, and in old nests made by other birds.
Some owls, like the Burrowing Owl, will even use tunnels made by burrowing animals like the prairie dog and the squirrel to lay their eggs.
Most owls do not build nests, even when laying eggs.
How To Find an Owl’s Nest
If you want to find an owl’s nest, you should first research the kinds of owls that live in your area.
Each owl has its own nesting pattern, and you might learn where to look for nests simply by learning more about the species near you.
Common signs that an owl is nesting nearby include:
- White excrement, which is known as whitewash.
- Pellets of regurgitated food.
Owls eat their prey whole and regurgitate approximately fist-sized pellets full of fur, bones, and other items they cannot digest once they’re done with their meal.
If you see whitewash or pellets, look up in the trees nearby for cavities.
If you find an owl’s nest, remember to keep your distance and be careful not to disturb them.
Ideally, you shouldn’t visit the nest any more frequently than once every 3 to 4 weeks, and you should avoid using imitation bird calls to grab their attention or solicit interactions.
Most owls keep the same nesting location from year to year, so remember that as you observe any nests you might find near you.
Enjoy the privilege of witnessing continued activity over a long period.
And know that disruption could cause severe difficulties for a bird unaccustomed to finding and building a new nest each year.
Do Owls Mate for Life?
Owls do mate for life in most cases. And in barn owls, scientists have witnessed the birds continuing to court each other even after pairing together in previous seasons.
Even after mating in previous years, the birds will use certain flight patterns, calls, and food offerings to tempt each other.
Part of the reason why it makes sense for owls to keep the same mates from one year to the next is that they keep the same territory and nests from year to year.
Also, most owls do not migrate, so it’s simple to maintain a partner and a territory once they’ve established it.
How Owls Find Mates
Male owls typically start a mating season by looking for a nesting location, then try to attract a female to that spot to start a brood.
The owl may use flight patterns and calls to grab the attention of females in the area, and once they respond, the owl may present food to his preferred mate.
This mating ritual usually happens once a year in the spring, though some species are exceptions.
Like the Great Horned Owl, which starts its breeding season in early December.
Once the owls have found their mates and the females have laid their eggs, there is just a 30-day incubation period until the eggs are hatching.
That means that the peak of the breeding season for owls is usually during the summer.