Taking Turns At The Trough

I haven't noticed any Lesser goldfinches at the bird feeder before.  Maybe I simply haven't been paying attention.  I happened to snap this shot just as it was preparing to fly off and the house finch was coming in for a landing. 

I can't seem to keep that feeder full!  Two full cans of seed gone in less than a day.  That doesn't even account for the can I spread around on the walls and stones!  Hungry buggers!