If you find yourself on the receiving end of a glare like that, the chances are that the mammal in question is thinking about eating you. This is probably not the best time to try to introduce yourself to that particular mammal.
Obviously, this doesn’t apply to me. Mammals love me. Even those two weird cats belonging to my cousin, whom, you might recall, I stopped by to visit on the way back from the Bay Area, so I could help out with the kids.
House cats aren’t technically big enough to eat you. That doesn’t mean they don’t think about it now and then.
Those two cats are really very sweet despite their ferocious facial expressions… but I am glad they aren’t the size of tigers.