The Rat Fan Club's article on bedding
RMCA's Litter Comparison Aritcle
The Bad Beddings
CEDAR
BAD! May mask odor but the phenols that allow the bedding to do that are toxic to your rat's lungs, trachea, and liver. To read more about this topic visit The Toxicity of Pine and Cedar Shavings by Debbie "The Rat Lady" Ducommun
PINE
BAD! It may keep mites and flies away but that's precisely one of the reasons it's toxic for your rat too. See above article for more information.
The Good Beddings
RECYCLED PAPER & NEWSPAPER
CareFRESH
Cell-Sorb Plus
WOOD BASED
SAFE CLUMPING LITTERS
ALTERNATIVES