Colorful fish dancing in the sea

Just like humans, animals use signals to communicate with each other. Communication (sending and receiving signals) can be disturbed by the environment. If this happens, it is possible that the intended receiver does not understand the message contained in the signal or does not notice the signal at all. You can compare this to when you shout to attract the attention of a friend across the street, but it is rush hour and he or she does not hear you through the traffic.