A bison right where Woody Woodpecker would have put it!
The fenceposts along this road are riddled with holes created by acorn woodpeckers to store their fall acorn harvests. If you drive slowly you'll notice that there will be a woodpecker sitting on top of about every tenth post guarding its hoard. As you approach, the birds fly to safety in the oak trees which along this road are mainly valley oak, Quercus lobata. Some of the fenceposts have so many holes in them that they are falling apart, most likely the reason the fence has been reinforced with metal stakes.
Acorn woodpeckers (Melanerpes formicivorus) live in tribes in oak or pine/oak woodlands. They harvest acorns from the oak trees and store them in individually drilled holes in one or more storage trees (or in this case, fenceposts!). Their granaries have been observed to hold over 50,000 nuts! The woodpeckers hammer fresh acorns into the holes tightly and move them as the nuts dry out and become loose. The birds also eat insects, fruit, flower nectar, grass seeds and lizards.
Walter Lantz is believed to have patterned the call of the cartoon character Woody Woodpecker after the birds he and his wife heard on their honeymoon in June Lake, California. Woody's appearance, however, is a combination of the acorn woodpecker and the crested pileated woodpecker.