The coqui (Eleutherodactylus coqui), a tiny tree frog native to Puerto Rico, continues its spread through the islands of Hawaii. According to this article from the Honolulu Advertiser, their spread is being aided by the nursery industry, which is accidentally transporting the frogs in shipments of plants like bromeliads and palms. The frogs hide in the soil and under leaves, and are difficult to find. The search for an effective control continues: application of caffeine, while quick, was determined to be too expensive and potentially dangerous to other organisms. Hawaiians are now considering citric acid, but the acid also damages many plants.