Monarch Butterflies have contrasting colors of black and orange, and are one of the most familiar of butterflies. Both sexes have the same appearance, and the wingspan is 3 to 4 inches. The well known caterpillars are banded with yellow, black, and cream. Tentacles are present at both ends of the body of the caterpillar.
Monarchs are a primary example of true migration in insects.
From their natural home in the Western Hemisphere, they have spread to Hawaii, Indonesia, the Canary Islands, and Australasia. They are also known from the Mediterranean. Normal migration patterns in the United States in the fall lead to northern Mexico and California. Several broods are produced throughout the year. There is no swarming during the spring flight.