I don't know what kind of tree this is. I'm thinking maybe a variety
of oak. Anyway, every winter in Southern California, they have to be
cut back like this. This particular tree is probably 50 feet tall.

In the spring, this tree will send out shoots from
all these branches and be thick and leafy. If the shoots, which become
as thick as small branches, aren't cut back in the winter, the tree
soon gets out of control. It is usually trimmed after dropping all its
leaves. This tree will be nearly twice the height you see here once
the shoots and leaves return next spring.

By the way, anyone knowing MORE about this would really make me smile
if you would put that information in your comments below. Thanks!