Humans for eons assumed that whales and dolphins chirped, clicked, or sang to communicate with each other until they discovered, quite recently, that there were other means being used. As anyone underwater when a stone strikes an object will attest, sound traveling underwater is magnified beyond the affect above the surface. Of course, this is simply the mass of water moving, rather than the mass of air moving, and water is heavier, affecting the ear drum with greater force. Thus, when utilizing sound waves setting water in motion, whales and dolphins chirp or sing little notes, but never shout. But communication has been observed between members of a family many miles apart, even an ocean apart, and the means of communication is little understood. Man, who uses ricocheting radio waves as a form of communication, understands that as long as the sender and receiver are using the same code, any directed wave can be used as a communication tool, be it water waves or otherwise.
Just as humans hundreds of miles from each other can be in telepathic communication by sharing the same brain wave frequencies in similar patterns, whales and dolphins as species with common biological backgrounds speak to each other in this way. They are suspected of having even greater communication talents by the military, which in their envy has studied them. Being biological creatures, whales and dolphins can only produce as a means of communication that which the corporeal body will support! Human beings clap their hands, wave, vibrate their vocal cords in recognizable patterns, and throw rocks. Whales and dolphins slap their tails on the ocean surface, chirp and sing, and swim in patterns that carry meaning to the others.
Humans send telepathic signals that other humans attuned to them can and on occasion do receive. Whales and dolphins, not having an opposable digit that allows them to experiment with various means of communication, worked more intensely with what they had. Their telepathy for one another is operant, not only sent but listened to by the others. They not only speak soundlessly, they are heard. However, their songs, carried mile after mile through the water, does not lose its intensity as would a song in the atmosphere. Water in the ocean does not blow about as does air, as being more dense it sends pressure forward in the form of a wave, and from one side of an ocean to another this sound can carry. For a lost member of a family, hearing the song heard when young is a call to rejoin the family. Thus what humans are observing is not only the whale or dolphin's ability to receive what appears to be soundless communications, but strong hearts that act on these communications. They love one another.