"They almost always pair with the opposite color morph for breeding. The two color morphs occur in approximately equal numbers. Both male and female white-strip

"They almost always pair with the opposite color morph for breeding. The two color morphs occur in approximately equal numbers. Both male and female white-striped birds are more aggressive than tan-striped birds during the breeding season." https://en.wikipedia.org/wiki/White-throated_sparrow https://en.wikipedia.org/wiki/White-throated_sparrow