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www.allaboutbirds.org/guide/Northern_Cardinal/id

The male Northern Cardinal is perhaps responsible for getting more people to open up a field guide than any other bird. They’re a perfect combination of familiarity, conspicuousness, and style: a shade of red you can’t take your eyes off. Even the brown females sport a sharp crest and warm red accents.

en.wikipedia.org/wiki/Northern_cardinal

The northern cardinal is a territorial song bird. The male sings in a loud, clear whistle from the top of a tree or another high location to defend his territory. The male sings in a loud, clear whistle from the top of a tree or another high location to defend his territory.

sciencing.com/tell-cardinal-bird-male-female-5750222.html

Anyone impressed by the plumage of the male northern cardinal will be floored by that of the male vermillion cardinal. Also known as the Venezuela cardinal, this rosy red bird is a little more than an inch smaller than the northern cardinal, and it sports a spike-like crest that extends straight up.

www.nytimes.com/2019/02/09/science/cardinal-sex-gender.html

A bird hopping outside the window lately is the strangest that Shirley and Jeffrey Caldwell have ever seen. Its left side is the taupe shade of female cardinals; its right, the signature scarlet ...

www.thecardinalexperience.com/bird facts.php

The male cardinal is very territorial and protects his breeding space from any male that comes his way. During the mating season, which begins in March, the males are so hot-blooded, that although they breed near birds of other species, they will never allow one of their own kinds to nestle in their territory.

www.nationalgeographic.com/animals/2019/01/half-male-half...

“Cardinals are one of the most well-known sexually dimorphic birds in North America—their bright red plumage in males is iconic—so people easily notice when they look different,” Hooper says.

en.wikipedia.org/wiki/Cardinal_(bird)

An American male cardinal feeds on a sunflower seed. Cardinals , in the family Cardinalidae , are passerine birds found in North and South America . They are also known as cardinal-grosbeaks and cardinal-buntings.

www.forbes.com/sites/grrlscientist/2019/02/05/bizarre-half...

Thanks to the developmental fusion of male-female bird twins into one individual, this northern cardinal is half red and half tan -- split lengthwise down its middle -- and is half male and half ...

www.allaboutbirds.org/guide/Northern_Cardinal/overview

Find This Bird. The brilliant red of a male Northern Cardinal calls attention to itself when males are around. You can also find cardinals by getting a sense of the warm, red-tinged brown of females – a pattern you can learn to identify in flight.

www.nationalgeographic.com/animals/birds/c/cardinal

The northern cardinal is so well loved that it has been named the official bird of no fewer than seven U.S. states. ... Male birds feed their monogamous partners as they incubate clutches of eggs ...