A modular bird feeder system has a plurality of different modular bird feeder components which can be interchangeably connected based on user preference. All components are slideably mounted on a vertically standing pole. The slideable components include a feed filling funnel, an upper feed tray, a lower feed tray, a squirrel guard, and a feeder unit position adjustment handgrip which controls the upward and downward movement along the pole of the integral bird feeder unit which is assembled. An adjustable locking pin extending from the pole is used to maintain the bird feeder unit in the uppermost bird feeding position on the pole, regardless of which components are being used. When the pin is removed, the handgrip facilitates control of the bird feeder unit as it slides from its bird feeding position to a user-friendly, convenient feed filling position on the pole.