If you call a cat; it will ignore you and keep doing what it wants; never acknowledging that you are there.
If you call a goat; it will ignore you and keep doing what it wants; while acknowledging that you are there and daring you to do something about it!
Just a few minutes ago I had to deal with this yet again!
They were in the barn, trying to tear open cardboard boxes.
(They just LOVE cardboard for some reason!)