Utility of creation

وَٱلْخَيْلَ وَٱلْبِغَالَ وَٱلْحَمِيرَ لِتَرْكَبُوهَا وَزِينَةً ۚ وَيَخْلُقُ مَا لَا تَعْلَمُونَ

And [He created] the horses, mules and donkeys for you to ride and [as] adornment. And He creates that which you do not know.