What is the secret behind mentioning the creation of livestock in Surat Az-Zumar, verse 6, amidst a discussion about the creation of man?

The secret behind mentioning the sending down of livestock in Surah Az-Zumar after mentioning the creation of man is to demonstrate God's oneness and greatness by mentioning another type of His creatures, and to allude to the similarity in creation between humans and livestock, as Allah says: ﴿He creates you in the wombs of your mothers, creation after creation, in three veils of darkness. That is Allah, your Lord; to Him belongs the dominion. There is no deity except Him. So how are you averted?﴾ [Az-Zumar: 6]. Al-Baydawi clarified that the verse illustrates the manner of creation of both humans and livestock to demonstrate the wonders of God's power.