My birder companion Becky holds a nest she found on the ground at Advanced Energy yesterday, 3/19/2012. It looks like it was in the process of being built, but was blown out by the recent horrendous winds.
Tags: Collins, Ft., bird, nest
I asked Kevin Cook, a naturalist up here (NoCo).
Kevin Cook response: "Whenever I see a nest so heavily lined with plant floss, I immediately think Yellow Warbler and American Goldfinch. The weaving pattern is similar for both species, but the Yellow Warbler usually builds a nest deeper top-to-bottom than does the American Goldfinch. The Warblers often build a nest twice as deep as the nest is wide. Gauging from the comparative size of the nest and hand, the nest fits the measurements for either species. The shallowness of the nest, however, suggests Goldfinch is more likely.
If someone still has the nest, it could be checked for droppings. Warblers eat insects, so the dark part of their droppings will contain fragments of insects' exoskeletons. Goldfinches do not eat insects and do not feed them to their nestlings, so the dark part of their droppings will lack insectan exoskeleton but might contain visible portions of seed coats."
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