It is seriously itsy. Less than 5mm long, harmless, and one of the best moms in the world.
The Hawaiian happyface spider, called nananana makakiʻi, gets its name in an obvious way: there is what seems to be a clownlike happy face on its back—technically the back of its abdomen. No one has yet agreed whether this is an adaptation that scares off larger animals that would enjoy a spider snack, or some more complex DNA shuffling happening within the population that just happens to make patterns that look like a happy face. There are thought to be nine species in the Hawaiian Islands with different “faces” or no “face” pattern at all.
But, although the happy face is certainly interesting to look at, this unusually long-legged, glassy, yellow-green jewel of an arthropod is complex in some possibly unexpected ways. For one thing, these wee Theridiidae-family spiders live on the undersides of leaves in the cool, upper-elevation native Hawaiian wet forests of Maui, Hawaiʻi Island, Molokaʻi and Oʻahu. At Hawaiʻi Volcanoes National Park they can sometimes be found in the deep green forest around Nāhuku (Thurston Lave Tube).

