All our birds get rope perches and most of them chew the rope off, leaving the attachment (white plastic piece). So I came up with a use for these little things. I clean them, and stuff them with peanut butter, either chunky or regular and then re attach them to the cage. The birds LOVE it and it keeps them occupied trying to lick and beak all the peanut butter out of the little "cups". Just an idea if anyone else has these attachment pieces laying around from former rope perches.