Black oil sunflower seeds have a higher oil content than the grey striped sunflower seeds. It's good for wild birds in winter, because it fuels them in the cold. Parrot owners more often prefer to feed the grey striped sunflower seeds as treats. Grey striped is usually what people eat, also.
Edited to add:
You might want to think about starting a worm bin or culturing some other type of bug, worm or larva to supplement protein. Fish is good protein, too, if you have a pond available. I think field peas are even better for them than soy, if you want to grow field peas.
Edited to add:
You might want to think about starting a worm bin or culturing some other type of bug, worm or larva to supplement protein. Fish is good protein, too, if you have a pond available. I think field peas are even better for them than soy, if you want to grow field peas.
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