"Scientists tallying the economic damage wrought by invasive pests across the world found two species are responsible for more harm than any other.

The American bullfrog and brown tree snake have collectively caused $16.3bn (£13.4bn) in global damage since 1986.

In addition to ecological harm, the invasive pair have ruined farm crops and triggered costly power outages.

Researchers hope their findings will encourage more investment to help block invasive species in the future."

Leo Sands reports for BBC News July 29, 2022. [2]