Strong migration habits ensure the Red Admiral reaches across all three countries on the North American continent, making it easy to run into.
Red Admirals are hard to miss and easy to identify thanks to their size and distinctive color and patterns. It can be found yearlong in warmer states and in Mexico, but only in the summer months in the north. These migrants can produce one or two broods during their time up north. The cold winters kill off any that remain. Adults in warm regions hibernate through the winter. Large populations migrate north again the next year, especially in the eastern half of the continent, enabling the species to return every year. In desert regions, the butterflies start to move up the mesas and mountains at the beginning of Spring's warm-up.
Adults can be found in virtually any habitat, ranging from rural to urban, subtropcis to tundra. They prefer to drink sap from trees, liquid from rotting fruit and bird droppings. They will drink nectar from milkweed, clover, aster and alfalfa flowers if their preferred foods are not available. Males are active in the mid-afternoon to evening, looking for females. They dart out at approaching objects, quick to defend their territories from any living creature. Females lay a single fertilized egg on a leaf of the larval host plants. Caterpillars eat the leaves of nettles, false nettles, mamaki, pellitories from the aster family and other related plants. Once caterpillars hatch, they form a retreat of folded leaves and silk. The caterpillars are black, developing white, or light yellow, speckles all over the body. Several black, branched spines radiate from each segment; these spines may be white closer to the rear of the larva. There are seven yellow bands, bent into the shape of upside-down 'V's, that mark each segment along the sides from head to rear.
Scientific Name: Vanessa atalanta
Butterfly or Moth
Size (Adult; Length): 40mm to 75mm (1.56in to 2.93in)
Note: An insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed above as they are driven by environmental factors (such as climate change), available food supplies and mating patterns. Grayed-out selections indicate that the subject in question has not been reported in that particular territory. U.S. states and Canadian provinces / territories are clickable to their respective bug listings.
Butterfly and Moth Anatomy
Antennae: Butterflies and Moths have a pair of antennae on the head used as sensors.
Head: The head is home to the insect's eyes, antennae, and proboscis.
Thorax: Home to the three pairs of legs as well as vital internal organs.
Abdomen: Contains vital internal organs such as the heart(s) and reproduction facilities.
Forewing: The upper, forward wing pair used for flying.
Hindwing: The lower, rearward wing pair used for flying.
NOTE: Butterflies and Moths are part of the Lepidopteran order as they share many similarities.