Tag Archives: Falco sparverius

Bergmann’s Rule

This gallery contains 2 photos.

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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American Kestrels 2015

American kestrels (Falco sparverius) are year-round residents of Big Valley CA (Modoc County), where we live. For as long as I can remember, kestrels have raised a yearly brood on a ledge between the double outer walls of our hay … Continue reading

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Vernal Equinox

Because we live in a rural setting, Leonard and I find ourselves intimately aware of the cyclic nature of the seasons. Each season, in turn, brings its own fluctuations, which we anticipate and often document. At this time of the … Continue reading

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2013 American Kestrels

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In both 2011 (American Kestrels) and 2012 (Young Kestrels) a pair of American kestrels (Falco sparverius) that nest in one of our hay sheds (Modoc County CA) fledged four youngsters. Leonard and I always enjoy watching the aggressive juveniles as they … Continue reading

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Young Kestrels

This gallery contains 6 photos.

I recently introduced one of the four American kestrels (Falco sparvarius) raised in our hay shed this season. The four kestrel fledglings are flying about the yard, providing plenty of entertainment as they squabble among themselves for prime perching sites and … Continue reading

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Kestrel Fledgling

This gallery contains 2 photos.

In March I noted that a pair of American kestrels (Falco sparvarius) appeared to once again be nesting between the outer walls in our hay shed. For many years kestrels, also called sparrow hawks, have raised a brood in our … Continue reading

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Kestrels Win??

This gallery contains 4 photos.

In January I mentioned that a northern flicker (Colaptes auratus) was checking out the nook in our hay shed where American kestrels (Falco sparverius) customarily nest. Perhaps this season the flickers would usurp the kestrels for that prime nesting site. On a … Continue reading

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