This is the Golden-Crowned Sparrow. Biggest sparrow we have here and we have big flocks of them at times here at the house. Beautiful song comes from these song birds!!
The Golden-Crowned Sparrows are also a smart species, like all sparrows I guess? Seen at bird feeders, or gardens looking for that something to eat as the one in the photograph is doing at one of our little ponds. I watch these sparrows quite a lot for they are one of the common birds here at the house.