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Iguanas should not be fed lettuce, fruit cocktail, processed human foods, or any single fruit or vegetable as a main diet. Green iguanas require a varied diet of chopped fruits, vegetables and greens to stay healthy.
Melissa Kaplan's excellent recipe for Iguana Salad (no, it is not made with real iguanas) is probably the best basic diet. It consists of 1/2 cup shredded raw green beans, 1/2 cup shredded raw orange fleshed squash (acorn, bananna, kabocha, spaghetti squash or pumpkin), 1/2 - 3/4 cup alfalfa pellets or crumbled alfalfa hay (not sprouts), 1 medium or 2 small shredded parsnips, 1/4 cup mashed or minced fruit (berries, mangos, papaya, figs, cantalope, but NOT avocado)
You can make and freeze this in batches, but be sure to add some brewer's yeast to replace the thiamine (B1) that is lost in the process.