US Patent 7685969 Liquid bird feeder

A liquid bird feeder provides a liquid container having a bottom opening, a liquid tray adapted to attach to the liquid container and adapted to immerse the bottom opening in liquid, wherein the liquid tray includes a bottom port passing through the liquid tray and vertically aligned with the bottom opening, and a valve mechanism adapted to selectively couple the bottom port of the liquid tray to the bottom opening for filling purposes, or to close the bottom port and couple the bottom opening to the liquid tray for supplying liquid from the liquid container to the liquid tray.