Koa / Hawaiian Blue Butterfly (Udara blackburni)
The Hawaiian Blue (Koa) butterfly is one of only two native butterflies in Hawaii. It’s undeniably cute, with a one-inch wingspan, fuzzy body, and big eyes. You will immediately notice the dual effect of its iridescent wing colors, blue on top and aquamarine beneath, with the wings usually held upright when it lands.
If you get close enough, you will see its whimsical black-and-white striped antennae. Both the adult and caterpillar are known for feeding on the koa tree, though they can feed on other native plants as well.
ID Guide: Hawaiian Blue (Koa) Butterfly
Use the photos and information below to identify the Hawaiian Blue butterfly and caterpillar.