During dark moonless nights the eyes are useless and the ears and other senses must take over the heavy burden of reassuring - a burden which they in fact cannot carry. Therefore the dark nights belong to the invisible whispering ghosts and frightened people crowd together inside their sheds.

At dawn light arrives gradually, colours later than black and white and grey. Likewise, the rainbow colours do not arrive until sun shines again.

Light and sound are subdued by rain. When sun arrives in the morning the birds start to sing again, and according to South American myths their colours also arrive with the death of the great watery monster.

Ghosts have no colours and they do not talk loud, they whisper like the sea shells on the beach.

"... Men and birds joined forces to destroy the huge watersnake, which dragged all living creatures down to his lair. But the attackers took fright and cried off, one after the other, offering as their excuse that they could only fight on dry land.

Finally, the duckler (K.G.: a diver) was brave enough to dive into the water; he inflicted a fatal wound on the monster which was at the bottom, coiled round the roots of an enormous tree. Uttering terrible cries, the men succeeded in bringing the snake out of the water, where they killed it and removed its skin. The duckler claimed the skin as the price of its victory. The Indian chiefs said ironically, 'By all means! Just take it away!'

'With pleasure', replied the duckler as it signalled to the other birds. Together they swooped down and, each one taking a piece of the skin in its beak, flew off with it. The Indians were annoyed and angry and, from then on, became the enemies of birds. The birds retired to a quiet spot in order to share the skin. They agreed that each one should keep the part that was in its own beak. The skin was made up of marvelous colors - red, yellow, green, black, and white - and had markings such as no one had ever seen before. As soon as each bird was provided with the part to which it was entitled, the miracle happened: until that time all birds had had dingy plumage, but now suddenly they became white, yellow, and blue ...

The parrots were covered in green and red, and the macaws with red, purple, and gilded feathers, such as had never before been seen. The duckler, to which all the credit was due, was left with the head, which was black. But it said it was good enough for an old bird ..." (The Raw and the Cooked)

"... The white egret took its piece [of the skin of 'Keyemen - the rainbow in the shape of a huge watersnake'] and sang, 'ā-ā', a call that it still has to this day. The maguari (Circonia maguari, a stork) did likewise and uttered its ugly cry: 'a(o)-a(o)'. The soco (Ardea brasiliensis, a heron) placed its piece on its head and wings (where the colored feathers are) and sang, 'koro-koro-koro'. The kingfisher (Alcedo species) put its piece on its head and breast, where the feathers turned red, and sang, 'se-txe-txe-txe'.

Then it was the toucan's turn. It covered its breast and belly (where the feathers are white and red). And it said: 'kión-he, he kión-he'. A small piece of skin remained stuck to its beak which became yellow. Then came the mutum (Crax species); it put is piece on its throat and sang, 'hm-hm-hm-hm' and a tiny remaining strip of skin turned its nostrils yellow. Next came the cujubin (Pipile species, a piping guan), whose piece turned its head, breast, and wings white: it sang, 'krr' as it has done every morning since.

Each bird 'thought its own flute made a pretty sound and kept it.' The richly colored plumage of the macaw is explained by the fact that it seized a large piece of skin and covered its whole body in it ... " (The Raw and the Cooked)

(Scarlet Macaws, Wikipedia)