good quiz, but since Cardiff City changed their home strip from blue to red, their nickname (and the symbol on their logo) has since changed from the bluebird to the red dragon.....
The blue birds was always their nickname... Even with the change of badge to the dragon, the blue bird still remained on the badge, it just got smaller
Barnet = Bees
Brentford = Bees
Colchester United = The U's
Spurs = The Yids (though controversial even as self-label)
Port Vale = The Valliants
Yeovil = The Glovers
etc.