Ask me a riddle

For some reason, this little bit of magic from Winnie-the-Pooh has been in my head all week. Enjoy!

Cottleston, Cottleston, Cottleston Pie,
A fly can't bird, but a bird can fly.
Ask me a riddle and I reply
Cottleston, Cottleston, Cottleston Pie.

Cottleston, Cottleston, Cottleston Pie,
Why does a chicken? I don't know why.
Ask me a riddle and I reply
Cottleston, Cottleston, Cottleston Pie.

Cottleston, Cottleston, Cottleston Pie,
A fish can't whistle and neither can I.
Ask me a riddle and I reply
Cottleston, Cottleston, Cottleston Pie.