Cecropia Moth

I found this guy outside the barn. 

He's a cecropia moth, the largest North American moth.

I like his feathery antennae.

Here's a table explaining the difference between butterflies & moths.

Insect	Butterfly	Moth
Antennae	rounded clubs on the ends	thin or often feathery
Body	thin and smooth	thick and fuzzy
Active	during the day	during the night
Color	colorful	dull
Pupal Stage	chrysalis	cocoon
Wings	held vertically when resting	held flat against body when resting