Magnificence of the Creator in birds
Nahj al-Balāgha|Volume 1|Book 1|Chapter 165
وَنَسَقَهَا عَلَى اخْتِلاَفِهَا فِى الاْصَابِيغِ بِلَطِيفِ قُدْرَتِهِ، وَدَقِيقِ صَنْعَتِهِ؛ فَمِنْهَا مَغْمُوسٌ فِي قَالَبِ لَوْن لاَ يَشُوبُهُ غَيْرُ لَوْنِ مَا غُمِسَ فِيه، وَمِنْهَا مَغْمُوسٌ فِي لَوْنِ صِبْغ قَدْ طُوِّقَ بِخِلاَفِ مَا صُبِغَ بِهِ.
He has set them in different colours by his delicate might and exquisite creative power. Among them are those which are tinted with one hue and there is no other hue except the one in which they have been dyed. There are others which are tinted with one colour, and they have a neck ring of a different colour than that with which they are tinted.