Tatiana,
sorry I saw your post before but the Polish word for buffalo has so many Polish letters that I had to look at my Polish letters dictionary to give you exact translation. It is:
baw�ł - how is it in Russian?
female cow is "krowa" (I guess it is "korowa" in Russian and the male is "byk".
Here is one of the recently featured articles in our site is about Polish bison and vodka:
http://www.bellaonline.com/articles/art24934.aspBialowieza Forest; Polish Bison, Bison Grass & Vodka & Krupnik