Why are some House Finches more red than others?
Though we typically think of House Finch as red, they actually come in a few color variations. Different subspecies may show color variations, but differences in color are also attributed to diet. When a bird is molting, its diet will determine the colors of its new feathers.
Do House Finches change color in winter?
Beginning in September, and continuing for six to eight weeks, they molt all of their feathers, ending up with a completely new and pristine set of feathers (and drab colors) as they head into the winter.
Why do male House Finches have red plumage?
Plumage coloration ranges from yellow to bright red depending on the amount of carotenoid rich foods they eat; the more carotenoids in food the brighter red they become.
House finches will often reuse a nest. To discourage them from inhabiting the site, use bird netting or screening to block the area, or remove hanging plants or wreaths for a week or two.