Earlier quoted context omitted.
I'm guessing you mean the bison. (At least that's what Belovezhskaya Pushcha is known for, other than being the largest area of primeval forest in Europe.)
Buffalo and Bison are often interchangeable in American English. I know in Polish, "żubr", which is the European Bison, is often translated as buffalo and the American Bison is known as "bizon" which is understandably translated as bison. I would not be surprised if Belarusian was similar.
And buffalo (like African and water) is "буйвал".
I had no idea American English used "buffalo" and "bison" interchangeably.
Learn something every day. :)