The momzer was subject to gravity and the physics of a pendulum in ways a bird could not understand. It would begin with bold resolve, clambering down the chain from the overhang, hurling itself from a nearby trellis. But within seconds it would find itself clinging by its forepaws to the metal peg, or to the bottom of the tube, its tail madly switching, while the birdfeeder bucked and gyrated and worked to shake the momzer loose.