Hidden in the branches, deep in the viburnum, the Northern mockingbird guards its larder. Its ticket to spring. Even at this time of the year, late winter, there are still a few withered blue berries hanging on the shrub, and I'll be darn if this mocker is going to share.
The best place to find a mockingbird in March is to search for the viburnums, hollies, privets still bearing their precious little fruits. Mockers are berry eaters, and once they find a loaded bush, it's theirs! They will guard it for days, weeks, months, as long as its bounty endures.
A mocker will let a photographer approach, but NOT another berry-eating bird. No sir!
Ergo: If you have berries to guard, hire a mockingbird.