HOW CAN ANIMALS AND BIRDS SEE IN DARK ?

    Almost all animals and birds can see in dark. But humans cann't  see in dark or in night clearly. Just because of that ability to see in dark, some animals and birds can servive easily in this word ( owls). We all know they can see during day too, but ability to see in the dark make them special than humans.  

  Let's see how they can see in the dark.

  The animals which can see in dark called as nocturnal animals. Nocturnal means ability to see in the dark. They can see in the dark just because of there eyes structure. Nocturnal animals eye contain specific rods cells that carry rhodopsin in the eyes that helps in the night vision. that rhodopsin are very sensitive to longer red wavelength. 

       Retina is the composition of rods and cones. Rods are not able to capture light as sharply as cones do. but That rods are very sensitive to low light level and hence responsible for the vision in night. Different animals have different capacity see in the dark, and that capacities varies with amount of rods cells.

We can see some of nocturnal animals in the image.

But there are lot nocturnal animals just like tiger, fox, dog, lions. 

          Dogs have very good vision in the dark, that is why dogs are very useful in the dark for hunting, and to keep watch around houses. 

     Just like dogs, owls also have very good vision in the night as compare to other birds. We all know, owls always do hunting at the night, just because of that special night vision ability. 

    But in case of humans eye it's not possible to see in the dark, without any source of light. 

  because human eyes contain           just 125 million rods cells, this amount of rods cells is only sufficient to see in deem light and slightly in the dark.