Humans can feel the waves of sound that move at a frequency of cycle per second. But the waves of sound that move at a frequency of more than one thousand cycles per second cannot be heard human ears. In contrast, dogs, cats and foxes can hear the sound sixty thousand cycles per second. Rats, bats, whales and dolphins can hear sound waves of one hundred thousand cycles per second. Fish can also sense the slightest vibration in the sea. The visibility range in the human eye is very much less when compared to the honeybee, which can see ultraviolet rays. In comparison to humans, the eyes of the royal falcon can see an object magnified eight times.