Noble forest Mogwai.
1. Don't keep him indoors for long periods of time (he should be taken outside before sunset).
2. Never feed him processed or "unnatural" foods (chips, fast food, candy etc.).
3. Don't get him wet while he`s eating (never give him water while he`s eating or give him food in the rain). Otherwise, a new Deerlin will appear, but it's much smaller, very angry, and twice as voracious!