I read a children's book in 1965, which was about a raven. It had a red and black cover I think, with drawings inside. It was such a wonderful,almost mythical story that I've never forgotten its impact on me, but I can't seem to find it now. I think it might have been called 'The Raven'. Does anyone have any memory of a book like this?
I don't know your particular book Izitso but I can tell you that the raven is known as a trickster in a lot of mythology. Search for the word "raven" on the enclosed Wikipedia page - he appears for instance under MYTHOLOGY and COYOTE - and it may evoke some memory for you. (Did your raven steal sun, moon and stars...?)