Concept is mature, they soon find ditches - always a deeper ditch. We have mines as sensor-sentries, right? MM wave radar/IR rifle aiming sentry 'bots were cre

Concept is mature, they soon find ditches - always a deeper ditch. We have mines as sensor-sentries, right? MM wave radar/IR rifle aiming sentry 'bots were created ~~10 years ago, if memory serves. How about squirrel mounted tiny rifles - ~2 mm, work for peanuts...