I don't want it to seem like I'm saying you're doing everything wrong, but I don't with corn cobbed bedding.
Here's a website that explains why and which type to use:
http://www.birdsnways.com/wisdom/ww12eiii.htm
If you don't feel like reading it all here is the important stuff:
Corn Cobs - Once ingested, corn cobs can remain in the body for years before causing illness or death. Ingested corn cobs absorb moisture and swell, which can cause impaction, bleeding and death. Baby birds can also develop bacteria and yeast infections from the ingested material. When wet or in humid climates, cobs can grow Aspergillus molds which cause a respiratory disease in birds. This disease is difficult to treat and can be fatal. The cobs will also absorb moisture from your bird's droppings, promoting growth of organisms and hiding loose poops. It's a poor material for examining droppings.
Paper Products - Paper products are the safest materials to use for bedding. Unprinted newspaper, printed newspaper, paper towels, any plain paper and even brown paper bags can be used. Paper towels are expensive and very absorbant and are a better choice for chicks. If using printed newspaper, don't use the glossy pages or the pages with colored ink as these inks may contain lead and other harmful chemicals. Paper and paper products are very easy to change and allow you to visibly monitor droppings. They are also relatively inexpensive.
So for your bird's sake, use paper materials to line your bird's cages. NEVER use corn cobs, walnut shells, cedar shavings or kitty litter. Limit pine shavings to nesting material. If a new product comes along, do some research and see how it passes the above criteria before you consider using it.
Paper is not only safer, it is also cheaper. For those of you who don't like the look of newspaper, you can get unprinted newspaper or plain paper in bulk from many sources.
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I wouldn't recommend you spray anything on the area. Birds are hardy in some areas, but they're also fragile. Please get the cone. Also, get him different toys. They can even be a pine cone. I remember somewhere I read, "a pine cone a day, keeps the plucking at bay."
If you do decide to give him pine cones, you can either sterilize it yourself or buy them at the pet store.
Here's a list of things you can buy at the dollar store to make toys:
Popscile sticks (plain, not coloured)
Wood beads
Wood blocks
Wood Spoon
Wood chunks
Plastic beads (big and sturdy)
Bird safe metal rings
Safe rope or bird safe metal chain
Small golf balls (the type with holes in it)
Straws
Natural food dye (to dye the wood items)
Tools needed:
Power drill
Something to cut the metal chain
Toys you can make:
I'm sure if you search online you'll find plenty of inspiration.