I've finally figured it out! I always thought it was funny that they back
up when they do their "thing". Friends always comment about it and I say
"that's just the way they do it". But there really is a reason. Very smart
when you think about it.
We've all heard the saying "keep your back to the wall", well that's what
they do to protect against an ambush when in a vulnerable position. The
beep, beep is the signal we use as a warning of a potential "illegal
dumping". :-)
SP
[Posted in FML issue 2188]