Enormous Appetites

If I could positively identify the most gluttonous bird in my back yard, I think the American Goldfinches would wipe the floor with the relatively piggy House Finches.  I notice that sunflower seed tubes empty faster at times when I see goldfinches, and a small family group routinely drains one tube in as little as two days.  And heck, they are not even feeding young yet!  This is the price I pay for seeing the vivid plumage.  Hopefully they will spread out the pigfest among my neighbors!  Goldfinches! Ack!