What is it, you ask? Why it's a simple bird feeder... for the simple birds. What it's not is a squirrel feeder for those complicated squirrels. After spending a few hours hearing about the pack of 10-12 squirrels who were gorging themselves on the birdseed... and watching my friend trying to scare them off... and also her tales of greasing up the post - to no avail. What seems to have finally worked is this large diameter tube - one that the squirrels can't get their little arms wrapped around. Funny, eh? To what lengths we have to go to to outwit those little critters!?