How do animals see the world? Humans see the world in a way, but that doesnt
mean animals see it the same way. Each species sees the world in a different
way. Some see it in black and white, while others
sense different kinds of light and colors that humans have never seen. Each animal’s vision is appropriate for
the environment and survival needs of their species. In today’s video, we are gonna learn about
the vision of some animals that live in our planet. Let’s start with dogs. Even tho it’s usually thought that they
see in black and white, recent studies have proven this to be wrong. They can distinguish blues, reds, yellows
and browns. They have a dichromatic (daicromátic) vision
they build with only two colors. Dog’s eyes only have two kinds of visual
recipients, so they cant reproduce the whole range of hues humans have. They can distinguish red blues and green blues,
but they have difficulty distinguishing between greens and reds. Their eyes are different from ours, and this
has an influence upon their visual field, their depth perception, their visual acuity
and their movement perception. Dogs vision is different from that of humans,
more specialized and adapted to low luminosity. Let’s continue with one of our favorite
animals: cats. We know you like them too, thanks for sending
so many pictures of your feline pets, they are all adorable! Kitties can distinguish some colors, but they
dont care about it a whole lot; for them, what’s most important is focusing on the
movement of their preys. In broad terms, their vision is pretty similar
to that of dogs. Their visual acuity is lower than it is in
humans, they cant see very well up close nor during the day. It all changes when the night comes. They have a complicated eye tissue that reflects
light after having absorbed a great amount of i and before it gets to the rétina, which
gives them a sharper vision in the darkness and makes their eyes glow when it’s dark. With their nictitating membrane, or third
eyelid, they protect their eyes from foreign bodies. Birds have a high visual acuity that allows
them to fly safely, escape from prédators and sight their food from afar. It depends on the kind of bird, but usually,
their eyes are big compared to the size of their head. They have 4 different types of photoreceptive
cells int heir rétina, they are tetrachromatic, which provides them with a better perception
of colors. Also, together they have the shape of a mosaic
(móusec), which allows them to sense colors in any part of their rétina. They can even sense colors of the non visible
spectrum, they can see ultraviolet rays, invisible to our eyes. This allows them to see traces of urine left
by their preys. They can also sense slow movements, they can
see how the sun moves in the sky, something very useful for migratory (máigratori) birds
when they travel. Rats and mice’s vision is quite limited,
their sense of smell and touch are more important for rodents. Just as most mammals, they have a dichromatic
(daicromátic) vision. Their blue cones have a wavelength shorter
than that of humans; therefore, contrary to us, they can see ultraviolet light. Also, since their eyes are located on the
sides of their head, they have a really wide range of vision, and they can move each eye
independently from the other. Snakes sense the world in a totally different
way than us. Tho, in broad terms, their vision is not very
different to that of any other vertebrate, except for a couple of extraordinary details. First, instead of eyelids they have ocular
scales that they renew along with their skin. Some snakes have infrared receptors in pits
between their nostrils and their eye, and with them they can “see” the heat given
off by other animals. With their thermal vision, there is no prey
that goes unseen. In broad terms, fish usually have a great
visual field and a great peripheral vision, sinc their eyes are located on both sides
of their head, – they can see pretty much anything around them. Their perception of colors varies a lot, tho
it is not particularly good. Most of them are adapted to see any color
other than blue, main color on the bottom of the sea. Lots of them also have a great night vision,
with special adaptations or ultraviolet light reception. Flies and many other insects have an extraordinary
eyesight, characterized by a compound eye, which consists of a lot of small and simple
eyes that, combined, create a fragménted image. They sense an image that seems to be in slow
motion with a low rate of frames per second. This is why we usually find it difficult to
catch them. They can also sense the ultraviolet range,
which is essential for their everyday life. What’s your favorite animal? Leave a comment and let us know!


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