Pine Siskin at the feeders

Yesterday just one little Pine Siskin mixing with the common house finches. Today, a whole flock of these dainty little birds with yellow on wings and tail. My bird books say they are 4.5 to 5.5 inches in size, but side by side with the finches, they seem on the smaller of that scale - tiny little things.

This is not my picture. I tried to get close enough for a picture, put seeds right by the patio door and then crept to the door flat on my stomach to get a close-up view. I would say perhaps 20 of the little things altogether.