Quite honestly you can feed them almost anything but a good diet is important if you want to keep your rat or mouse healthy for a long time. Most of the stuff at petstores is pretty bad - poor nutrients and mostly filler.
I am not sure about mice but there is a great diet for rats called Suebee's Rat Diet. You can find it here: http://www.ratsrule.com/diet.HTML
There are also many good lab blocks available by order or at various feedstores. One is the best (imho) is Harlan Tekland, but there are other brands like Mazuri, and Regal Rat that are readliy available at feedstores.
Some people also feed rats dog food with low protein (try to keep the protein under 20% you can find these by looking at Lite formulas) - one good recommendation is Holistique Blendz Adult Dog Food.
Here are some foods to keep your rat away from:
Avocados
Blue Cheese
Carbonated Drinks
Chocolate - small amounts of Milk Chocolate is okay (such as a chocolate chip)
Dried Corn- fresh corn in small amounts is okay
Dry Beans
Green Bananas
Green Potato Skins and Tubers
Licorice
Orange Juice - although Oranges are alright as long as there is no peel or rinds.
Raw Sweet Potato
Raw Red Cabbage
Raw Peanuts
I also don't tend to feed my cucumbers, lettuce, or spinach.
The purpose of a typical mouse, in computer terms, is to help the user make selections on the computer easily and accurately. If you're talking about the mouse (animal), then the purpose of mice is to exist in the food chain. Birds, among other animals, feed on rats. Thus, rats are somewhat essential in maintaining food chains, food webs, and etc.
Yes, rats are a problem for farmers. They can be a problem in several ways. Rats can eat food crops. They can eat grain used to feed livestock or saved for planing. These are just examples, not a list of ways
Yes, they do. Their favorite thing is peanut butter, but I feed my pet mouse fresh fruit on occasion.
If rats can't find plant items to feed on, yes rats will feed on garbage or even animals. However, the animals that rats feed on would already be dead. Rats are scavengers; this is also why rats carry so many diseases. Only when rats can find no other food sources will they turn to something living.
She might, but the mother won't be able to feed her babies and the rats for very long, as rats need waaay more milk than mice. Plus, the rats could eventually hurt the mouse when they grow older.
The food which was fed to rats was water and food containing: carbohydrates, proteins, fats and minerals.
you should never feed a coca spaniel a rats food
Feed it! Feed her normal dietary requirements (found in a pet food store) and give her "treats" which would be what she would want to eat if she was rummaging through your cabinets. My rats like goldfish crackers and cinnamon toast crunch most but there's always bread and cheese lol. After a week or so she will come to you for food and as long as she is not a timid mouse she will eventually take it from you and come to you in general.
Lab blocks are the best and most complete staple diet for pet rats. Try to find ones that list soybean meal ad the first ingredient on the ingredients list. Avoid ground corn, its carcinogenic for rats (i.e. a cancer causing agent). Also, avoid buying seed mixed sold as standard rat food in pet stores. These are unhealthy and often low quality. Generally rats will only pick out the best (and least nutritious) bits from it and leave the rest. You should also feed your rats fresh vegetables a few times a week.
mice and rats
They always need food and water, milk will make them sick.
you should have someone come in and feed them