Birds are incredibly good at the sight and never miss their prey. They have different levels of vision which enable seeing in light and night. The answer is positive. Most birds can see at night flawlessly. Even some nocturnal birds like bats, owls, and frogmouths can see better than others in the dark. Thus, they cannot see in total darkness like the cats.
Consequently, we can see their movement in the daytime mostly. But it isn’t very clear about their night in the air. Can birds see at night? Or can they hunt at night?
We are here to explain birds’ vision at night in detail. You can learn about their eye anatomy, the features they own, activities, and some other interesting facts.
Eye Anatomy of Birds
The eye is the most important one among the five senses of birds. These nightcrawlers heavily depend on their vision.
They can find the right food and mate with powerful sight, flee from predators, and reach their destination. Human and bird eyes have a similar structure like lenses, cornea, and retina.
Even some birds have bigger eyes than others (for example ostriches). Again, the songbirds have more giant eyes than brain size.
Most birds’ eyes are like reptiles. Instead of being spherical like ours, they own flatter-shaped eyes to better focus and visual to the target.
Also, the increased retina size helps to get bigger and more explicit images. Light can easily enter birds’ eyes for their larger pupils. It helps to see under reduced light.
Additionally, the fovea cells inside the retinas contain around 400K photoreceptor cones per square millimeter.
It is only about 200K in humans. That’s why birds can see with better details.
The Great Visual Optics
Birds are unique creatures. Likewise, they possess several unique visual optics or features. These features are different and more supermassive than others.
The Vision of UV Rays
Birds can process a better wavelength spectrum (300-400nm) than we do. Some fishes, amphibians, and reptiles can process like this.
Hence, the power of UV vision gives the birds enormous benefits, among other creatures.
It enables them to focus on any prey, mammals, fruits, eggs, etc., quicker even in their flight. Also, they can differentiate a monomorphic bird’s genital character using UV vision.
Perception of Color
The sensory color perception of birds is known as magnetoreception. It helps them like a GPS we use to identify the location, direction, and altitudes.
Usually, they use this power on dark nights. Some studies show that the fowls can see plane-polarized light. It is an example of a built-in magnetic compass.
Also, it can shift if there is slight light absorption. They can detect color to differentiate between locations and altitudes using photoreceptors.
It probably impacts the visuals of the colors of things in front of them. Tetrachromat birds can see things in four colors: UV and RGB (red, green, and blue).
We humans can only see RGB colors. It explains that birds possess a great color perception.
Detection of Motion
Motion detection is an important factor for birds’ vision.
When the birds are in flight at a good speed, the unit frequency of seeing greatly increases. In the case of humans, we can only see 60Hz consistent motions, whereas birds can see around 100Hz.
Again, the fovea of prey birds is double that of most predator birds. It is good for tracing any motion. Surprisingly, birds like pigeons can only detect movement at 15°/h.
Diurnal and Nocturnal Birds
Birds are two types of vision at night: diurnal and nocturnal.
Birds remain more active under daylight in diurnals, while active at the night are known as nocturnal. Examples:
- Diurnal: golden eagles, kites, parrots, hummingbirds, vultures, woodpeckers.
- Nocturnal: owls, boobooks, nightjars, nighthawks, frogmouths.
There are two receptors inside birds’ eyes: rods and cones. Rods are extremely sensitive to dimmer light.
Nocturnals have more rods than cones. Thus, the excess rods help them better vision in the dark. Also, they allow getting more light to give a perfect view even at night.
As a result, nocturnal birds can hunt, feed, and protect their family well at night.
Diurnal birds have fewer rods than cones. It is why they cannot remain active at night like nocturnal. Their night vision is limited, yet they can see better than humans in the dark.
For instance, we can see 12x less than the geese at night. Still, geese are diurnal birds, right?
Many birds sleep at night, taking shelter in trees, cavities, and niches. On the winter days, they huddle closer to keep their body warm.
Again, some birds like ducks can float in water while sleeping. Birds like ostrich can keep their eyes open while standing on their legs while sleeping.
Monocular vs. Binocular Vision
The eye location can tell if the bird has monocular or binocular vision. If the bird has eyes in front of its head, it will be a bird with binocular vision.
Owls and Eagles are examples of birds with this feature like we have. It can help these birds see more depth and distance than binocular birds as they can see the same object concurrently.
Monocular birds can focus on two objects simultaneously. It means they can see everything surrounding them at the same time.
Pigeons and parrots have a wider field of vision. So, this possession of monocular vision can easily help them identify their predators.
Which Bird Can See at Night
Some birds can see better in the dark than others. Here’s a look at six of the most nocturnal birds and their eyesight:
- The owl is a bird that can see in the dark up to twice as far as a human.
- The nightjar can see in the dark up to 6 times better than a human.
- The black-capped chickadee can see in the dark up to 10 times better than a human.
- The nighthawk can see in the dark up to 50 times better than a human.
- The hummingbird is considered one of nature’s most adapted creatures to seeing in the dark. They can see at night as well as during the day and he has a color vision (like humans).
- The bat can see in the dark more than any other creature. A group of bats called a swarm can see in the dark as far as 500 meters (1,640 feet) away!
So, have you got the answer to “can birds see at night?”? Yes, they can see, fly, hunt, and protect their allies from predators. Also, they can see better than us on the darkest nights.
If you read the anatomy of birds’ eyes, you can easily assume the bird you see if it is capable of seeing at night or not.
Also, you can say if it is binocular or monocular. Lastly, nocturnal birds are better viewers at night than diurnal.
Eye Anatomy Source: archives.evergreen.edu
As a bird enthusiast, I write to inspire and educate others about the beauty and importance of avian species in our ecosystem. Find me in Twitter