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User / Old Geezer. Is illiterate / Sets / Sparrows
Peter Giesbrecht / 97 items

N 173 B 1.2K C 44 E May 25, 2020 F May 26, 2020
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N 126 B 1.3K C 30 E May 13, 2020 F May 18, 2020
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The White-throated Sparrow comes in two color forms: white-crowned and tan-crowned. The two forms are genetically determined, and they persist because individuals almost always mate with a bird of the opposite morph. Males of both color types prefer females with white stripes, but both kinds of females prefer tan-striped males. White-striped birds are more aggressive than tan-striped ones, and white-striped females may be able to outcompete their tan-striped sisters for tan-striped males

N 182 B 1.4K C 46 E May 13, 2020 F May 15, 2020
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N 181 B 1.5K C 62 E May 13, 2020 F May 14, 2020
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The White-throated Sparrow comes in two color forms: white-crowned and tan-crowned. The two forms are genetically determined, and they persist because individuals almost always mate with a bird of the opposite morph. Males of both color types prefer females with white stripes, but both kinds of females prefer tan-striped males. White-striped birds are more aggressive than tan-striped ones, and white-striped females may be able to outcompete their tan-striped sisters for tan-striped males

N 139 B 1.3K C 39 E May 7, 2020 F May 16, 2020
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