Birds in the Winter - Goldfinch

Lately we've been seeing more and more goldfinches at our feeders. In the winter, goldfinches don't migrate, instead they lose their bright yellow breeding colors allowing them to blend in nearly seamlessly with the sparrows. 
An indicator of spring is the color of these little birds, as their numbers have been increasing a fine yellow hue is slowly hinting just under the winter coats. Soon molting goldfinches will be easily spotted with patches of yellow mixed with gray. 
Goldfinches are one of the few strictly vegetarian birds. If a cowbird lays its eggs in a goldfinch's nest, the hatchlings rarely survive due to the plant based diet of the goldfinch.