Amorpha juglandis

Amorpha juglandis, or the walnut sphinx is a type of moth. It is a part of the genus Amorpha which only has one species (which makes it Monotypic). It is in the family of Sphingidae and was noted by Jacob Hübner in 1809. It was first described by James Edward Smith in 1797.
It is native to North America. It is found from the Atlantic Ocean to the Rocky Mountains in Canada and the United States.
Description.
The wingspan is 45–75 mm.
Biology.
The adult moth is nocturnal.
The caterpillar feeds on alder ("Alnus"), hickory ("Carya"), hazelnut ("Corylus"), beech ("Fagus"), walnut ("Juglans"), and hop-hornbeam ("Ostrya") species. The caterpillar can make a high-pitched whistles. It comes from spiracles in its abdomen. This will startle the bird which will probably not eat it because of that.