True. . . but normally a bird shot load is an excellent home protection load in a twelve guage. It will take out the baddie and won't go through the too many walls and take out your children sleeping down the hall. . . even if a few pellets get down there, individually they have only a small amount of energy and won't do much injury.
Birdshot won't even take out an Iphone, don't suggest it is an "excellent home protection load". It is not. A heavy winter coat can stop bird shot. In fact, you're more likely to get bouncers with bird shot and take out your own eyes. #4 is the smallest shot to even consider. That's a Turkey load and while a Turkey is a bird, #4 is not considered bird shot. The best home load is #1 buck.