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Oats, dried seeds, and other grains are great to give to a chinchilla that doesn't eat much more than pellets and hay. These types of supplements can be a great source of calcium and other minerals. Once a week to every two weeks seems to be a good frequency for feeding it.
Chinchillas need: 1  Constant access to clean drinking water from a drinking bottle, checked twice daily. Without water chinchillas can become seriously ill. 2  Good quality hay which should make up the majority of their diet and should be available at all times. A hay rack is a good way of offering hay.