Howler

"The Fog Horn" is a fantasy short story by Ray Bradbury, first published in 1951 (written in 1949). Other title: "The Beast from 20,000 Fathoms; Up From The Deep".

The story inspired the authors of the plot of the film "The Monster from the depth of 20,000 fathoms" (English: "The Beast from 20,000 Fathoms").

There is a lighthouse near the cape. There are two people on it, and one decides to tell the other a story about a sea monster living under the water column, which can be summoned using a device that makes special sounds.

In the water column lives a lonely creature, similar to a dinosaur, which takes the sound from the lighthouse for the voice of its relative. In the book , the creature is written as follows:

... head, a large dark head with huge eyes and a neck. And then, no, not the body, but the neck again, and again and again! A head on a beautiful thin dark neck rose forty feet above the water. And only after that, a body emerged from the abyss, like an island of black coral, mussels and crayfish. The flexible tail twitched. The length of the body from the head to the tip of the tail was, I think, ninety-one hundred feet.

The creature makes exactly the same sounds as the device on the lighthouse:

The monster opened its huge, toothy mouth, and a sound came out of it, exactly repeating the voice of the Howler. Lonely, mighty, far, far away. The voice of hopelessness, impenetrable darkness, cold night, rejection. That's the sound it was.

The creature intelligently and quickly realizes that the sound is not made by the same creature, but by a mechanical device on the lighthouse, and destroys the source.