Category Archives: Birds

Happy Ending

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This post is simply a story with a happy ending and pictures of a cute little bird. Last week a friend brought over a lesser goldfinch female (Spinus psaltria) that crashed into her glass sliding door in Lookout CA (Modoc … Continue reading

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Bergmann’s Rule

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Bergmann’s Rule (the third ecographic rule) was formulated in 1847 by Karl (also seen as Carl) Bergmann (1814 – 1865), a German biologist. It states that the same or closely related species tend to be larger in colder climates. It … Continue reading

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Allen’s Rule

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There are three principal Ecographic Rules for terrestrial environments: Allen’s Rule, Gloger’s Rule and Bergmann’s Rule. Ecographic Rules are concerned with variations in traits (mainly morphological) of organisms over goegraphical gradients. Allen’s Rule was discussed previously. (see “Gloger’s Rule” 10-10-16) … Continue reading

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Finally!

With the arrival of February Leonard and I begin to listen and watch for the sandhill cranes (Grus canadensis). Usually we hear the far-carrying, loud, guttural bugling of the cranes before we see them. So far this year February has … Continue reading

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Wondering?

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For nearly 30 years Leonard and I have observed the red-tailed hawks (Buteo jamaicensis) in Big Valley (Modoc County CA). Not long ago as we were counting red tails along the road, I commented that the number of melanistic red-tailed … Continue reading

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Melanins

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Social Signaling A book I received for Christmas got me interested in melanins in bird feathers. Melanins are pigments found in most organisms. Their chemistry is complex and their functions in many organisms are not understood. In birds they are … Continue reading

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Surprise

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  Dark-eyed juncos (Junco hyemalis) feed mostly on seeds and insects. In winter the junco’s diet consists mostly of weed and grass seeds, while in the summer insects are added. Juncos forage mostly while hopping and running on the ground. … Continue reading

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