～頭
～とう · ～tou · JLPT N2 · noun
animal
🐄🐘 頭 = head: like English, you count cattle by the head
頭 literally means head. English ranchers count 50 head of cattle, and Japanese counts large animals the same way: 牛三頭 is three cows. Small animals like cats use 匹 instead; 頭 is for big ones.