The Yellownecked Caterpillar (Datana ministra) is a moth

Moth

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 , with thousands of species yet to be described...

 of the Notodontidae

Notodontidae

Notodontidae is a family of moths with approximately 3,500 known species. Moths of this family are found in all parts of the world, but they are most concentrated in tropical areas, especially in the New World...

 family. It is found in southern Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 and the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 east of the Rocky Mountains

Rocky Mountains

The Rocky Mountains are a major mountain range in western North America. The Rocky Mountains stretch more than from the northernmost part of British Columbia, in western Canada, to New Mexico, in the southwestern United States...

, in the south-west it ranges to California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

.

The wingspan

Wingspan

The wingspan of an airplane or a bird, is the distance from one wingtip to the other wingtip. For example, the Boeing 777 has a wingspan of about ; and a Wandering Albatross caught in 1965 had a wingspan of , the official record for a living bird.The term wingspan, more technically extent, is...

 is about 42 mm. There is one generation per year.

The larvae feed on Malus

Malus

Malus , the apples, are a genus of about 30–35 species of small deciduous trees or shrubs in the family Rosaceae. Other studies go as far as 55 species including the domesticated Orchard Apple, or Table apple as it was formerly called...

, Quercus, Betula and Salix species. Young larvae skeletonise the leaves of their host plant. Later, they feed on all of the leaf except the leaf stalk. They feed in groups. The larvae are yellowish and black striped and covered with fine, white hairs. The head is black. Full-grown larvae are about 50 mm long. Mature larvae drop to the soil to pupate underground, where they spend the winter.

Subspecies

• Datana ministra ministra
• Datana ministra californica Dyar, 1890