What's this larvae from?

[Grapebush]

Hi everybody,

Recently I've benn attacked by a lot of this larvae, and they're eating almost everything, in their way, specialy my fruit tree seedlings, my herbs, and even some ornamentals...
Does anyone knows what kind of bug develops, from these larvae? Recently I've noticed a few grasshopers on my backyard, could this be their larvae???

Thanks for any help!

[vlan1]

Looks like an inchworm to me, which turns into a geometer moth.

[Grapebush]

Looks like an inchworm to me, which turns into a geometer moth.

Thanks for your help.
After a quick Google search, it really looks like an inchworm, however I've never seen any kind of moth, in here, or even butterflies; so I'm tinking how did they get here...