Then Allah tells His servants to look at the birds held (flying) in the sky, between heaven and earth, and how He has caused them to fly with their wings in the sky. They are held up only by Him, it is He Who gave them the strength to do that, subjecting the air to carry them and support them. As Allah says in Surat Al-Mulk:

﴿أَوَلَمْ يَرَوْا إِلَى الطَّيْرِ فَوْقَهُمْ صَــفَّـتٍ وَيَقْبِضْنَ مَا يُمْسِكُهُنَّ إِلاَّ الرَّحْمَـنُ إِنَّهُ بِكُلِّ شَىْءٍ بَصِيرٌ ﴾

(Do they not see the birds above them, spreading their wings out and folding them in None holds them up except the Most Gracious (Allah). Verily, He is the All-Seer of everything.) (67:19) And here Allah says:

﴿إِنَّ فِى ذلِكَ لآيَـتٍ لِّقَوْمٍ يُؤْمِنُونَ﴾

(Verily, in this are clear signs for people who believe.)

﴿وَاللَّهُ جَعَلَ لَكُمْ مِّن بُيُوتِكُمْ سَكَنًا وَجَعَلَ لَكُمْ مِّن جُلُودِ الاٌّنْعَـمِ بُيُوتًا تَسْتَخِفُّونَهَا يَوْمَ ظَعْنِكُمْ وَيَوْمَ إِقَـمَتِكُمْ وَمِنْ أَصْوَافِهَا وَأَوْبَارِهَا وَأَشْعَارِهَآ أَثَـثاً وَمَتَـعاً إِلَى حِينٍ - وَاللَّهُ جَعَلَ لَكُمْ مِّمَّا خَلَقَ ظِلَـلاً وَجَعَلَ لَكُمْ مِّنَ الْجِبَالِ أَكْنَـناً وَجَعَلَ لَكُمْ سَرَابِيلَ تَقِيكُمُ الْحَرَّ وَسَرَبِيلَ تَقِيكُم بَأْسَكُمْ كَذَلِكَ يُتِمُّ نِعْمَتَهُ عَلَيْكُمْ لَعَلَّكُمْ تُسْلِمُونَ ﴾

﴿فَإِن تَوَلَّوْاْ فَإِنَّمَا عَلَيْكَ الْبَلَـغُ الْمُبِينُ ﴾

﴿يَعْرِفُونَ نِعْمَتَ اللَّهِ ثُمَّ يُنكِرُونَهَا وَأَكْثَرُهُمُ الْكَـفِرُونَ ﴾

(80. And Allah had made your homes a place of rest for you, and made dwellings for you out of the hides of the cattle which you find so light when you travel and when you camp; and furnishings and articles of convenience out of their wool, fur, and hair - comfort for a while.) (81. And Allah has made shade for you out of that which He has created, and He has made places of refuge in the mountains for you, and He has made garments for you to protect you from the heat, and coats of mail to protect you from your violence. Thus does He perfect His favor for you, that you may submit yourselves to His will.) (82. Then, if they turn away, your duty (O Muhammad) is only to convey (the Message) in a clear way.) (83. They recognize the grace of Allah, yet they deny it (by worshipping others besides Allah) and most of them are disbelievers.)