Animal feeder

1. An animal feeder comprising:

a feed reservoir comprising a flexible bag having a cavity for holding a liquid feed material; and

a feed dispensing assembly coupled to the feed reservoir, the feed dispensing assembly including a check valve to allow selective access to the liquid feed material, the check valve inhibiting feed leakage from the feed reservoir during pressure fluctuations within the feed reservoir, the check valve being activated by the bird;

wherein the check valve is a duckbill valve including at least two lip members that are tightly compressed against one another to inhibit feed leakage from the feed reservoir;

wherein the at least two lip members are separated when the bird applies a force to the check valve, creating a gap between the at least two lip members to allow the liquid feed material to flow out of the feed reservoir; and

wherein the flexible bag collapses as the liquid feed material flows out of the feed reservoir, and the duckbill valve creates a seal when the at least two lip members are tightly compressed against one another such that air is substantially inhibited from entering the feed reservoir.

2. The animal feeder of claim 1 , wherein the feed dispensing assembly includes a port for receiving a portion of the check valve, and wherein the portion of the check valve snap-fits within the port to allow selective access to the feed material.

3. The animal feeder of claim 2 , wherein the feed dispensing assembly includes a gasket surrounding at least a portion of the port to seal between the check valve and the port.

4. The animal feeder of claim 1 , wherein the feed dispensing assembly includes a perch positioned adjacent to the check valve.

5. The animal feeder of claim 1 , wherein the feed dispensing assembly includes a plurality of check valves to allow selective access to the feed material, and wherein the plurality of check valves inhibits feed leakage from the feed reservoir.

6. The animal feeder of claim 1 , wherein the pressure fluctuations are caused by at least one of thermal expansion and thermal contraction of the feed material within the feed reservoir.

7. The animal feeder of claim 1 , wherein the feed dispensing assembly is detachably coupled to the feed reservoir.

8. The animal feeder of claim 7 , wherein the feed reservoir is disposable.

9. The animal feeder of claim 7 , wherein the feed reservoir is reusable.

10. The animal feeder of claim 1 , wherein the feed reservoir extends substantially vertically from an upper portion to a lower portion, and wherein the feed dispensing assembly is coupled to the lower portion.

11. The animal feeder of claim 10 , further comprising a connector coupled to the upper portion of the feed reservoir, wherein the connector is configured to support the animal feeder from a support structure.

12. The animal feeder of claim 1 , wherein the duckbill valve is coupled to the feed dispensing assembly such that the at least two lip members extend inwardly toward the cavity of the flexible bag.

13. The animal feeder of claim 1 , wherein the seal created by the duckbill valve is located within a periphery defined by the feed reservoir and the feed dispensing assembly.

14. The animal feeder of claim 1 , wherein the duckbill valve inhibits mold growth within the cavity by inhibiting oxygen from entering the feed reservoir as the flexible bag collapses.