Invasive earthworms arrived with European settlers in North America, impacting forests and native species. They reduce ground cover and affect bird populations.
Introduced as pest control, cane toads in Australia became a major threat. Their toxins harm native species, causing drastic declines. Now widespread, they spread 30 miles per year.
Invasive zebra mussels from Russia have spread in North America, displacing native species, clogging valves, and accumulating toxins, impacting ecosystems.
Invasive rats devastated Macquarie Island, causing extinction of native birds. Successful eradication efforts were carried out by Australian government.
Introduced European starlings threaten native species, steal nests, and damage crops. Massive flocks dominate US landscape.
Brown tree snakes decimated Guam's native bird populations. High density, prey reduction, and power outages. Ongoing control efforts.
Tiny mountain pine beetles devastate pine forests. Bark-boring, fungus-infested, massive destruction. Climate change aids their range expansion.
Invasive seastar in Australia: voracious predator, threatens native species. Devastates spotted handfish, critically endangered.