Birds are especially varied and include woodpeckers, American goldfinches, sparrows, parrots, macaws and ravens. Goldfinches, purple finches, squirrels, and chipmunks eat the seeds of the tree. It contains the North and South American siskins and goldfinches. Common residents include blackcaps, nuthatches, green as well as great spotted woodpeckers and goldfinches. Songs of catbirds, American goldfinches and yellow-headed blackbirds can be heard. He has a fascination for birds, keeping personally bred canaries and goldfinches at home. Goldfinches and northern cardinals can be seen at feeders near the Nature Center. In winter, they often feed in mixed flocks including American goldfinches and redpolls. Birds that concentrate heavily on felted nests include goldfinches ("Carduelis" species) and related species. The seeds are eaten by goldfinches, linnets and greenfinches. This is considered undesirable, as it detracts from the allure of keeping European goldfinches.