I give mine a bit of cheese, or a stale cracker or peice of bread.
Mine love a bit of spinich, or a half a grape, of course Sunflower seeds & pumpkin seeds are a favorite.
Here is a quick list of my gerbil 'treats" and extras....
Cheese, Applesauce, Cranberry juice, Lettuce, Tomato, Carrots, Broccoli, grapes, apple, clover, boiled egg, cucumber, Dog Cookie, spray millet, Cat/Kitten food, Dried corn on the cob, honey bars, Frozen Fruits & veggies (summer treat)
All these things shoudl be given in small amounts.
oohh... and here is a list of some fo the things I put in my gerbil feed -
Raisins, Apple, Cranberries, Blueberry, Coconut, Raspberries, Papaya, Pumpkin, Banana, Pineapple,
Carrots, peas, Parsley, Alfalfa leaves, Potatoes, Parsley flakes, celery flakes, Red & Green peppers deiced, Cabbage flakes, leek flakes, diced Zucchini, tomato flakes, Spinach flakes,
Oat kernels, Millet (red & white), Pumpkin, Safflower, Sunflower, Rose hips, corn, barley, milo, wheat (middlings),
Peanuts (Spanish), almonds, walnuts
Cereals & Other
Corn flakes, wheat flakes, Barley Flakes, Oat groats, Wheat bran, cornflower, Soya bean meal, Extruded rabbit pellets, Cat food, Alfalfa or Timothy (hay and sometimes cubes), Dehydrated alfalfa meal, heat processed soybeans, soybean meal