Buy brands with dated packaging, or purchase manufactured foods from shops that turn over their inventory quickly. Some seed stored in the pyramids has sprouted thousands of years later. Although most pelleted diets are excellent, not all birds react in the same way to such a regimen. Remember, when you maintain a bird on a single food source, its health depends on that source. Pellets using animal byproducts may also contain gram-negative bacteria.
Some birds simply refuse to eat pellets.
No matter what tricks or methods their owners employ, the birds' stubbornness wins out. Some small birds have even been known to starve themselves to death rather than eat foods that are foreign to them. Seed hulls won't be a problem on a manufactured diet, but pellets can still be tossed about the cage and dunked into water dishes. Some birds also develop moister droppings when on pelleted diets, and this may necessitate some additional vigilance. Do not use without written permission.