The Valley Sentinel_May 2017

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Alamo • Danville • Blackhawk • Diablo • San Ramon

VALLEY

THE

SENTINEL always for the community VOl 22, nO 5

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May 2017

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SPOTLIGHT

Tassajara Hills Students Move On to Global Finals in Scientific Challenge

Top row (left to right): Emma Walsh, Alex Rhee, Kyra McCool. Bottom row (left to right): Parker Pierce, Joey Sabo, Max McCay

Over the past few months, Tassajara Hills Elementary was represented at the Destination Imagination (DI) Regional and State competitions. By placing first at

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The East Bay’s oldest foot race returns to the streets of downtown Danville on Sunday, May 7 at 8:00 a.m. Lace up your running shoes and join in the fun as hundreds of locals gather to participate in this annual tradition to benefit Discovery Counseling Center of the San Ramon Valley. The Run includes a 5K and 10K, a free Kids Fun Run and Expo The 5K is perfect for the speedsters as well as those just wanting to get out with their dogs and walk. Everyone is welcome. See story on page 7.

Great Horned Owl (Bubo virginianus) by James Hale

One of the characteristic nighttime noises of Contra Costa County is the haunting duet of a pair of Great Horned Owls. It can commonly be heard yearround, widespread throughout the county. The loud, low pitched hoho-hoo-hoo-hoo, is diagnostic. The female’s call is higher and rises in pitch at four syllables. Great Horned Owls and Anna’s Hummingbird are two of our earliest nesting species, with courtship and nesting recorded as early as December. The loud, raspy begging calls of the juveniles follow as the nestlings fledge. Many wildlife species pay special attention to the Great Horned Owl, and adjust their schedules to avoid the most feared nocturnal avian predator, also known as the hoot owl and tiger owl (winged tiger). The Great Horned Owl (Bubo virginianus) is widely distributed

throughout Canada, North America, and much of South America. They prefer fragmented landscapes, however, are able to adapt to a variety of habitat types. They are part of the genus Bubo, which may include as many as twenty-five other extant taxa, predominately distributed throughout Africa. The Great Horned Owl radiated across the Bering Land Bridge to the Americas. Pleistocene era paleosubspecies fossils of Bubo have been found across North America from Georgia to California, mostly in the Rocky Mountains and west of them. These ancestors were significantly larger than modern Great Horned Owls. Genetic testing has verified that the snowy owl is the most closely related living species.

The bulky body shape, prominent broad ear tufts or plumicorns, white throat patch, and distinctive barred, c a m o u f l a g e p l u m a g e a re distinguishing characteristics of the Great Horned Owl. The male puffs up his white throat during courtship, and it may serve as a visual stimuli in the low light conditions typical of when the species courts. The color of the fascial disc varies geographically. Females are thirty percent larger than the males, allowing the pair to take a broader variety of prey. Large female Great Horned Owls have fully spread feet, from talon to talon, exceeding eight inches with at least 500 pounds per square inch (PSI) of crushing power. These large females may weigh up to six pounds with a body length in excess of two feet

This month’s Special Sections:

Senior Services

pages 8-9

Home & Garden pages 10-11

and a wingspan over five feet. The function of the horns or ear tufts is not fully understood. It is generally accepted that they serve as a visual cue in territorial and socio-sexual interactions with other owls. See OWLS page 7


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