Green iguanas are America's largest. They're from the tropics. Florida is iguana-infested. Iguanas tunnel under pools, foundations, walkways, and roads.
Crayfish like rocky freshwater. Rusty crayfish inhabit southern streams. Wisconsin and Minnesota. Fishing bait. Invading rusty crayfish eat small fish and fish eggs.
Burmese snakes. 20-foot-tall giraffe-black. Pet or escaped pythons infested the Everglades. Larger animals consume wood storks, Key Largo wood rats, and limpkins.
European Starlings invade Eurasia and North Africa. Thin-beaked, chubby birds are robin-sized. Summers are iridescent purple-green, winters dark with white spots. Yellow beaks.
European and Asian carp are native. Long dorsal fin and upper-jaw whiskers. Globally invasive carp. Globally, they were introduced to meet US fresh fish demand.
Red lionfish, also called zebrafish, can be deadly. Caribbean, eastern U.S., and eastern Mediterranean infested. Red lionfish threaten coral-cleaning fish.
Wild boars inhabit Eurasia and North Africa. One of the most invasive mammals in Oceania and North America. Wild boar harm plant species, deplete resources, and transmit disease.
Grayish-brown Cane Toads have large dark brown warts. Latin America. Cane toads invade Florida and Australia. Both used them to control sugar cane pests.
In non-native areas, brown rats carry disease and ruin home systems. The brown rat, often called the common rat, is larger than the black rat and house mouse.