Answer:
熊 YUU, kuma - bear
馬 BA, uma, ma - horse
牛 GYUU, ushi - cow
鳥 CHOU, tori - bird
鹿 ROKU, ka, shika - deer
It's 牛; All the others are in prefecture names.
熊本 Kumamoto
群馬 Gunma
Ushi is only in city names, such as 牛久 Ushiku.
鳥取 Tottori
鹿児島 Kagoshima