Where'd that one come from?

So...one day I went outside and discovered there was a fourth zucchini plant growing right next to the third one.  It would seem that the critters didn't get one of the two seeds they dug up when they had been digging up that one spot.  I thought they'd both gone...I guess I should have dug a little more to make sure.  If they don't choke each other out...anyone want some zucchini?  :-)

See the two plants practically growing on top of each other?
They're at the top of the picture.