This is the 3287th most frequent Turkish word.
hayvanın
"Hayvanın" means "of the animal" or "the animal's" in English.
In this sentence, 'hayvanın' functions as a possessive noun, where the suffix '-ın' indicates possession.
Hayvanın kuyruğu çok uzun.
The animal's tail is very long.
Here, 'hayvanın' again denotes possession, specifically associating the sound with the animal.
Hayvanın sesi gece boyunca duyuldu.
The animal's voice was heard throughout the night.
In this instance, 'hayvanın' is used to refer to the animal in a descriptive context, still maintaining a possessive meaning for emphasis.