Goldfinches in Salem in their spring best.

A lot of us living creatures change our outer layers. Dogs and horses shed as seasons change, new fur grows in. Our species changes clothes. Birds molt. Old feathers wear and fade. The sharpness and tightness of plumage is crucial for insulation, waterproofing and aerodynamic shape. In spring, it can be crucial for mating and nesting.

Right now, some of our birds are starting to change from the utilitarian drab winter feathers into the bold, look-at-me coat needed for spring courtship.

Here are a series of pictures of American Goldfinches in our Salem garden over a typical year. These first two pictures show a goldfinch next to a siskin. The finch has its usual bold white wing-bars, but is just starting to lose the winter drab, in spots, for the spring bright, pale yellow. These shots were taken in Salem on Jan. 9. Spring molt off to an early start.

The next photo was taken in May, all goldfinches in fresh, bright breeding plumage:

Here is one taken as the summer yellow and black is beginning to give way to autumn drab:

And here is a goldfinch in winter outfit, taken in early November:

When, how and how often a bird molts varies by species, climate, habitat and protein supply (protein is needed to form new feathers). Most birds have to carefully and symmetrically molt wing feathers. The gaps have to balance for the bird to keep flying straight. Many ducks lose all their wing feathers at the same time, hide in a marsh and don't fly again until all their new feathers grow in.

Nearly all the ducks we see now are in full breeding plumage. Those that migrate out will have courted and formed pairs BEFORE they depart here. So males have to be in their brightest colors now. When shovelers and pintails first arrived last fall, the males and females were hardly distinguishable.

Many young birds begin with kiddie plumage and the molt into adult appearance their first autumn. Yet gulls and eagles may take four years to go from kindergarten outfits to grown-up. A bald eagle with pure white head and pure white tail must be at least four years old. A first year bald eagle is mostly dark brown with pale splotches on wings and chest.

For information about upcoming Salem Audubon programs and activities, see www.salemsudubon.org, or Salem Audubon’s Facebook page.

Harry Fuller is an Oregon birder and natural history author of "Freeway Birding." He is a member of the Salem Audubon Society. Contact him at [email protected] or http://www.towhee.net/. His "Some Fascinating Things About Birds" column will be appearing regularly in Salem Reporter.

JUST THE FACTS, FOR SALEM - We report on your community with care and depth, fairness and accuracy. Get local news that matters to you. Subscribe to Salem Reporter starting at $5 a month. Click I want to subscribe!