Looks as though the Western Kingbird is starting to make an appearance in California. This feisty little bird is coming a pretty fair distance, too, arriving from southern Mexico and Central America, where it has been wintering. We've got some illustrative maps below, courtesy the good folks at eBird. By the way, if you don't think the Western Kingbird is feisty, check out this awesome photo of one defending its territory against a Red-tailed Hawk. Put simply, don't mess with this guy (photo by Peter LaTourrette):

Here's a look at the observation map for February. Not much going on for Western Kingbird:

And then, look at March. Here they come: