Parrot Food Pellets

So what's the deal with parrot food pellets? They're popular for many reasons but on the flip side, there are no pellet trees in the rain forest. With all the bird foods on the market, why would you select pellets over a seed diet? Can a bird survive on an all pellet or all seed diet?

Parrot Food Pellets 

Parrot food pellets came about to provide better nutrition for caged birds. Although many soft bill birds (like canaries & finches) have been living on a seed diet for years. Larger birds require a more balanced diet. Early on, parrot food consisted of sunflower, peanuts, corn and dried chili peppers which made it high in fat and except for the chili peppers there wasn't a whole lot of nutritional value. Read more about parrot food pellets here.