Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Gray Dagger (Acronicta grisea) is a moth of the Noctuidae family. It is found from the Atlantic to the Pacific coast in southern Canada and the northern United States.The wingspan is 30 40 mm. Adults are on wing in midsummer. The larvae feed on alder, apple, birch, elm, poplar and willow.A moth is an insect closely related to the butterfly, both being of the order Lepidoptera. Moths form the majority of this order; there are thought to be 150,000 to 250,000 different species of moth (about ten times the number of species of butterfly), with thousands of species yet to be described.