Strange But True: The Hidden World Only Animals Can See | Ultraviolet Vision #animals#amazing#viral

Many animals can see ultraviolet (UV) light, which is a range of the light spectrum invisible to humans. Animals like bees, birds, reindeer, dogs, mice, and some fish use this ability for important tasks such as finding food, identifying mates, and avoiding predators.

Some animals, like birds, have a fourth type of cone cell in their eyes that is specifically sensitive to UV light. In other animals, such as reindeer, dogs, and ferrets, the lens of the eye allows UV light to pass through to the retina, enabling them to perceive it.

While the underlying retinal cells of both humans and some animals can react to UV light, the ability to see it is primarily determined by two biological factors: the transparency of the eye's lens and the types of light-sensitive cells in the retina.

Many animals, including cats, dogs, hedgehogs, and reindeer, have lenses that do not filter out UV wavelengths. This allows the UV light to reach their retinas, where it is converted into nerve signals.

While humans have three types of colour-sensitive cone cells (for red, green, and blue), animals with full UV vision often have a fourth type of cone cell that is specifically tuned to UV wavelengths.

The combination of a transparent lens and specialized photoreceptors gives animals like birds and insects "true" UV vision, allowing them to see UV as a distinct colour.

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