When going through the desert, there are birds flying over head. Can you kill these? Do you get anything for doing so?
Yes you can kill these birds. The earliest method possible is using Red Enchanted Gloves (Throw a chocolate bar in the wishing well).
Upon killing the bird, you will receive a "desert bird feather" in your inventory. When hovering the mouse over the item, the text reads:
A desert bird feather
For an unknown reason,
you feel that this feather could be useful
if you have a pogo
Another way is to use the 'acid rain' spell which you can get from the sorceress across the bridge at the bottom of the map.