A liquid birdfeeder includes a generally upstanding container having a large opening at its top end and a bottleneck opening at its lower end. A quarter-turn removable cap is screw-threaded onto the top end to seal the top end opening. The lower bottleneck opening is screw-threaded into a central collar of a feeding basin having a plurality of feeding ports. An actuator rod extends longitudinally through the container and is operatively connected to a biased sealing mechanism which selectively seals or opens the bottleneck opening. When the removable cap is screw-threaded onto the top end opening, the cap depresses the actuator rod causing the biased sealing mechanism to move to an open position which allows liquid to flow out from the container into the feeding basin. When the removable cap is removed, the actuator rod can move upwardly under the force of the biased sealing mechanism, which moves the sealing mechanism to a closed position and prevents liquid in the container from flowing into the feeding basin. The container can then be filled through the top opening without flooding the feeding basin. In one preferred embodiment, the bird feeder includes a common functional feeding module connected within an outer decorative cladding by an interference fit.