The answer to the riddle was that the Blackbird was the odd one out, because the Female Blackbird is Brown where as all the females of the other birds mentioned are Black
But you said earlier that "it seems that blackbird is not the right answer" - see your posting on 19.9.06. These quizzes have somewhat tenuous rules or whatever,, don't they?
...and in any case - the females of all the other birds do not have black feathers - the female magpie has, like the male, black and white feathers. I would be taking that up with the quizmaster, if I were doing the quiz.... Perhaps it's as well I'm not.
The questions come from a radio audience so this maybe why, some of the answers are a bit weird and don't always seem logical. but my, thanks to you all, for your answers, most of the time, you clever lot out there, manage to get the right answer