Male goldfinches moult in fall, and resemble the duller colored female in winter.
Male cardinals are bright red in color and female cardinals are a reddish brown.
No. There are thousands of species of birds. Many birds do last the winter. For example, penguins, cardinals, blue jays.
Yes, they do lose their leaves in the winter.
The cardinals use the starch as fat to survive in winter months.
brown
red
Red and white.
is the oak tree keep color in winter
It depends on the type and the severity of the winter.
They actually lose the nutrients
Yes! Every bird molts. If it's a bird, it molts.