Identification of different colours by animals and birds.
It has been found that dogs cannot distinguish between different colours. Some dogs were given eatable of different colours. The variation in colours had no effect on them. This has proved that dogs cannot identify different colours. Some experiment of this type were also conducted on cats. Even they were found to be colour-blind. Besides man ape is the only mammal which can differentiate between different colours. All other mammals are colour blind.
The honey bee is also endowed with this unique property of colour discrimination. However it cannot identify the red colour. It appears black to it. It is on the basis of identification of colours that these bees are attracted towards the flowers of different colours from which they collect honey. The honey bee is capable of seeing the ultraviolet rays which even human beings cannot see. Even birds can differentiate between different colours. The colours of the male birds are more attractive than those of the female. Thus the females are attracted towards them because of their colours. It has been observed that birds can identify all the colours of the rainbow. Generally animals have no need to distinguish between colours because most of them hunt by night and do not depand on colour. However they have a greater power of smell and as such their colour blindness does not handicap them.
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