I notice that whenever I'm outside of my home (particularly in a high density public space), I sometimes subconsciously move my ears upwards and hold them in this tensed position, only relaxing them once I'm home and out of harm's way. I don't know if moving my ears has any effect on how well I can hear and detect threats, but, like an animal (or rather, a primalCHAD), I tend to do it anyway without even thinking. I like to think this ability is a eugenic trait and proof of my unequivocal genetic superiority over everyone who can't wiggle their ears.