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  • Road Closures Due to El Portal Fire

    The Big Oak Flat Road between Crane Flat and the El Portal Road is temporarily closed. There is no access to Yosemite Valley via the Big Oak Flat Road or Highway 120. Tioga Road is open and accessible via Big Oak Flat and Tioga Pass Entrances. More »

  • Campground Closures Due to Fire

    Crane Flat, Bridalveil Creek, and Yosemite Creek Campgrounds are temporarily closed. More »

  • Yosemite National Park is Open

    Yosemite Valley, Glacier Point, and Wawona/Mariposa Grove areas are open and accessible via Highways 140 and 41. Tioga Road is not accessible via Highways 140 and 41 due to a fire.

Wildlife and Other Sightings: Golden Digger Wasps & Feathers

August 04, 2012 Posted by: BW - Mather District Volunteer Interpretive Ranger

Golden Digger Wasp
Sphex ichneumoneus
Golden Digger Wasp burrowing  Golden Digger Wasp with prey

July 29, 2012
Big Oak Flat Information Station

Golden Digger Wasps are invading Big Oak Flat!  Don't be alarmed, these beneficial insects are not aggressive and will not bother you unless provoked. A colony of several dozen burrows was discovered in the Big Oak Flat Information Station parking lot median. These fascinating wasps could be seen actively digging, bringing a tiny ball of sand to the surface and spreading it out in a patchwork of tan over the grey gravel median. The Golden Digger Wasp is a gorgeous and colorful insect with golden hairs decorating its black head and thorax. A black tip caps its red-orange abdomen and matching legs. As deadly (to other insects) as they are beautiful, it didn't take long before these wasps were observed bringing prey to their nests. Wasp venom is designed to paralyze other insects and these wasps hunt crickets or grasshoppers. They bring the immobilized prey back to the nest to supply their larva with food. The larva will spend the winter in the burrow, emerging next summer to repeat the cycle. For being such an efficient predator, the adult wasp is actually a vegetarian, feeding only on flower nectars and other plant fluids. Not only do these wasps help control pest insects, but they are pollinators too!

Feathers on trail


Keep an eye out for feathers on the trail as the birds of Yosemite are replacing their flight feathers this time of year.  This process is called molting and it allows the birds to replace damaged or worn feathers. Although birds molt every year, not all feathers are replaced at once and some species take several years to replace their full set. This pattern of old and new feathers is a handy way for researchers to estimate the age of a bird. 


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Did You Know?

Train traveling along the Merced River to Yosemite National Park.

Starting in 1907, the Yosemite Valley Railroad brought passengers bound for Yosemite Valley up the Merced River canyon to El Portal. From there, they would take stagecoaches to the Valley. Some of the old train cars are now on display in El Portal.