Alfred Edmund Brehm,
Cassell's book of birds; vol. 1
“ When it has picked and thoroughly cleaned its feathers, elevating its tail and long shaft feathers, it raises the delicate plumage of a similar character to the sub-alar, forming a beautiful crest, and throwing up its feathers with much grace, appears as proud as a lady in her full ball dress. His prehensile power in the feet is very strong, and, still retaining his hold, the bird will turn himself round on his perch. He delights to be sheltered from the glare of the sun, as that luminary is a great source of annoyance to him if permitted to dart its fervid rays directly upon the cage. ”
