The mocking birds I’ve seen in CA were black with white wingtips ....or white with black wingtips. They’d sit on phone poles and sometimes just jump straight up in the air and then down again for apparently no reason ....
I think they were magpies not mocking birds that I was thinking about ....
Nah those are magpies. Mocking birds are bluish grey and have some piping that is occassionally black. the link I included has a couple of great shots. Others have posted nice shots as well