Two invasive species, the American bullfrog and the brown tree snake, cost the world an estimated $16 billion between 1986 and 2020 by causing problems ranging from crop damage to power outages, according to a study recently published.
The brown-and-green frog known as lithobates catesbeianus, which can weigh more than 1kg, had the greatest impact in Europe, according to research published in Scientific Reports.
The brown tree snake, or boiga irregularis, has multiplied uncontrollably on Pacific islands including Guam and the Marianna Islands, where the species was introduced by US troops in World War II, said researcher Ismael Soto.
The snakes have at times been so abundant that they caused power outages by crawling on electrical equipment, he said.
This signals the need for investment in controlling global transport of…