Birds have moods when it comes to having their pictures taken. All too often, they sit there quite still until the photographer begins to focus on them, and then, just a fraction of a second before the shutter clicks, they’re gone. I think they must sense the infrared rays of the focusing lamp. Or something. But when they want their portraits taken, they hold their place and turn this way and that — is my left side better? did you get the catchlight in my eye? — like a professional fashion model. That was the case with this California towhee Wednesday morning. It posed on a rock at the water’s edge just off the perimeter path on the west side and let me snap away all I wanted. It’s mostly a dull-colored bird, but note the subtle reddish tones under the tail and at the throat and around the eyes.