Disclaimer: I wrote these. Most of them I wrote or made for myself off-line, to help me learn about things. They are online in case they can help anyone else learn about varieties and stuff. I know there are mistakes in some parts, but as I find them, as I learn more, I correct them. If you can help with any of this, please mail me.

• Rat varieties database - different rat colours, markings, and types, and information on them.
• gene inheritance: How genes are inherited, dominant and recessive genes, partial dominance, polygenetic inheritance, quantitive inheritance, sex-linked genes.
• genetic terms: Some common terms used in explaining genetics.
• Housing options: Originally written for rat owners, but can be generalised.
• dilutes: Red and pink eye dilute genes, and the colours they produce.
• Breeding mink-based colours: Information on breeding standard mink-based colours such as mink, pearl, cinnamon, cinnamon pearl with some information on merles.
• Breeding siamese and himalayan: Information on breeding colourpoint rats.
• Worldwide Rat clubs: Information on the different societies at home and abroad.

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