Which animal does not make any sound?

Which animal does not make any sound?

وہ کونسا جانور ہے جو آواز نہیں نکالتا؟
Explanation

Scientific name: Giraffa

Height: Northern giraffe: 4.6 – 6.1 m

Mass: Northern giraffe: 800 kg 

Speed: 60 km/h