White-throated Sparrow 11/25/09

whitethroatedsparrowtan

These sweet singing sparrows are dimorphic, meaning they come in two color forms, one with white-stripes on the head like the bird I blogged about a couple of weeks ago, and another form with tan stripes on the head like the bird in the photo above. Many songbirds are sexually dimorphic, meaning the males and females look different. But White-throated Sparrows are more peculiar, roughly half are tan-striped and half are white-striped, and the color of the stripes has nothing to do with their sex. Most often they mate with a bird of the opposite color morph. The white-striped morphs (of either sex) tend to be more aggressive than the tan-striped form. Both forms have the crisply defined white throat, grey bill, and yellow lores. Fetched in Kittery Point.

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