: Sites like Freesound.org or Pixabay Music offer a wide variety of field recordings. These are great if you need "organic" sounds, such as a cow grazing or a distant moo in a pasture.
To find the right audio file, you can search for "cow moo sound effect" or the Russian phrase on these types of sites:
If you have a in mind (like a video or an app), let me know! I can help you find sounds with the right license or audio format for your needs.
: If you need the background noise of many cows at once.
If you're looking to download high-quality cow sounds—specifically the classic "moo"—there are several specialized platforms where you can find them for free or for professional use. Where to Find Cow Sounds