Two species, the Chinese mantis and the European mantis, were deliberately introduced to North America in the hope that they would serve as pest controls for agriculture; they have spread widely in both the United States and Canada.
Dúas especies, a barbantesa chinesa (Tenodera sinensis) e a europea (Mantis religiosa), foron introducidas deliberadamente en Norteamérica esperando que servisen para o control das pragas agrícolas; espalláronse amplamente por Estados Unidos e Canadá.