Koa / Hawaiian Blue Butterfly (Udara blackburni)
Blue Top Wings with Purple Edges
Copyright: Nathan Yuen
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.
Koa / Hawaiian Blue Photos, Facts, And Information
Yellow - Red Caterpillar
Copyright: Nathan Yuen
Aquamarine Bottom Wings
Copyright: Graham Burdekin
Iridescent Scales on Wings Reflecting Light
Copyright: Nathan Yuen
Coiled-up Proboscis
Copyright: Nathan Yuen
Black Antennae with White Dots and Red Tip
Copyright: Nathan Yuen
Hawaiian Blue Resting on Leaf
Copyright: Graham Burdekin
Iridescent Blue Top Wing
Copyright: Nathan Yuen
Koa / Hawaiian Blue Host and Nectar Plants
Host Plants for the Koa / Hawaiian Blue: (What is this?)
We are working on adding plants for this butterfly. See how you can help.
Nectar Plants for the Koa / Hawaiian Blue: (What is this?)
We are working on adding plants for this butterfly. See how you can help.
Koa / Hawaiian Blue Facts And Information
Butterfly Family: Gossamer-wings (Lycaenidae)
Butterfly Subfamily: Blue (Polyommatinae)
Butterfly Wingspan: 3/4 in. to 1 in.
Butterfly Habitat: Hawaii
Koa / Hawaiian Blue Flight Range Map
Note: Map represents approximate butterfly flight range.
