Postcard from Hawaiʻi – Koa The upper branches of an enormous koa against the sky at Hakalau NWR Related Posts Hāpuʻu Hāpuʻu Hakalau Wildlife Refuge Open House Share this:TweetWhatsAppEmail Author: Andrew An electrical engineer, amateur astronomer, and diver, living and working on the island of Hawaiʻi. View all posts by Andrew