Hint: Has one or more horns
The answer to this puzzle is:
1. BISON
2. GAZELLE
3. YAK
4. IMPALA
5. MUSKOX
6. CONCERTO
7. BULL
8. BUFFALO
9. ENSEMBLE
10. GIRAFFE
11. RAM
12. VIKING
2. GAZELLE
3. YAK
4. IMPALA
5. MUSKOX
6. CONCERTO
7. BULL
8. BUFFALO
9. ENSEMBLE
10. GIRAFFE
11. RAM
12. VIKING