They ignored a pot full of yellow S. flava buds but, once again, are attacking S. leucophylla and S. purpurea buds. *They either peck at or snap the buds right off. *But always leave them lying right there.
I've thought of bagging the buds, but the birds always strike when the buds begin to open. *I assume the yellow buds, like yellow strawberries and yellow raspberries, just aren't attractive to birds.