I love the fact that there is always something new to observe in nature. Take goldfinches, for example. I have often watched them devour milkweed seeds from an acrobatic, upside-down position. Recently, I spotted several bright yellow males perched atop dandelion stems, plucking the seedheads at a frenzied pace. Previously, I had only seen them snag dandelions in mid-air.
Of all our native songbirds, American goldfinches (Spinus tristis) are perhaps the most consistent vegetarians. Thistles are a favorite food source and nest material. Sunflower seeds are another top meal choice, something you have probably observed if you offer these popular seeds in a feeder. Aside from our freebies, goldfinches also eat seeds from grasses, weeds, teasel, mullein, and ragweed, along with birch and alder buds, maple sap, and berries. An uncommon agility allows them to extract seeds from any position. Their short, pointed, conical bills are well-suited to crack open hulls and other tough packaging. » Continue Reading.