Direct Chaotic Flux Quantification in Perturbed Planar Flows: General Time-Periodicity

A feeder for goldfinches comprising a hollow body for receiving and retaining feed, at least one perch on and exterior to the body, and a feeding opening positioned below and cooperating with the perch so that the opening is accessible only to a gold finch feeding upside down. Since the goldfinch is able to feed while hanging upside down and the housefinch cannot, the feeder accommodates the goldfinch and excludes other birds including the housefinch. The invention further comprises a method of attracting goldfinches and excluding housefinches comprising providing a feeder according to the invention, filling it with the appropriate goldfinch feed and hanging it.

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