I'm on zone 5. Something's wiping out my zucchini leaves, and FAST. Much of
the nibbling is from the middle of the leaves to the outside, so it doesn't
seem like the work of a mammal. And, there are no deer tracks. Haven't seen
the deer since early May. So....back to the bugs: In 20 years of gardening,
I've never seen zucchini leaves eaten. Stem borers, yes. But not this.

I've been out inspecting for bugs at about 12 different times in the past 24
hours - haven't seen a thing. WTF???