She needs to "hide" while brooding her eggs. If she was red like the males, she would be easy to see and be attacked.
Yes, female cardinal birds are brown because their dick has to be Brown so, so are they
Male cardinals are bright red in color and female cardinals are a reddish brown.
A female cardinal is typically a reddish-brown color with a crest on its head. A bird that resembles a small female cardinal in appearance is the female summer tanager, which also has a similar reddish color but lacks the distinctive crest.
You have described a female cardinal. Females are not red.
Northern Cardinal
Consult a field guide for cedar waxwing.
a cardinal's egg is white with brown speckles.
A cardinal Has a red stomace grayish colored wings and a black mask with a orange beakMale cardinals are a bright vibrant reddish color.However the female's coloration is a more reddish brown color.
Perhaps the cardinal sees herself reflected in the window and assumes it is another female cardinal trying to invade her territory.
The northern cardinal and the brown-headed cowbird have a symbiotic relationship. The brown-headed cowbird lays its eggs in the cardinal's nest (and in the nests of other species, too, such as the yellow warbler). This harms the cardinal's chances to reproduce. It's a parasitic relationship.
Brown bird with very red beak in MA is a female Cardinal
Female cardinals are primarily a pale brown color with reddish tinges on their wings, crest, and tail. They also have a reddish beak and a distinctive black mask around their eyes. Overall, their coloring helps them blend in with their surroundings to protect them from predators while they nest and care for their young.