A bird feeder wherein a housing includes a plurality of modular hopper elements with a floor underlying and supporting the hopper elements and a roof overlying the hopper elements, the hopper elements including impermeable side walls juxtaposed to form a hopper assembly of maximum capacity and minimum footprint and a front wall with feed apertures to enable birds to access bird food within the hopper element. Each hopper may be selectively removed and replaced without disturbing the other elements. In one embodiment, the hopper elements form segments of an inverted frustoconical hopper assembly which may be selectively and individually removed from the bird feeder without disassembling the housing. In another embodiment, each of the hopper elements is rectangular in transverse cross-section, and comprises a pair of spaced, generally triangular, parallel impermeable side walls interconnected by a pair of spaced, generally rectangular, front walls angled from the upper portion of the hopper element to the lower portion thereof, with the parallel impermeable side walls of adjacent hopper elements being juxtaposed in the housing and a plurality of feed apertures defined in each of the angled front walls adjacent the lower end thereof. A seed catcher may be provided underlying each hopper element with a depression formed in the floor of the housing to position the seed catchers.