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Joined: Mar 2011
And along with non-native bullfrogs, have caused great damage to native ecosystems, and native frogs, fish and macroinvertebrate populations.
An interesting note from the linked page:
"In Africa and Chile, X. laevis often migrates over land in swarms containing hundreds or thousands of individuals (Tinsley yet al., 1996; Channing, 2001; Lobos and Jaksic, 2005). Some of these mass migrations are stimulated by droughts (Tinsley et al., 1996; Tinsley and McCoid, 1996; Channing, 2001; Lobos and Jaksic, 2005). Nocturnal overland excursions may be quite common (Tinsley et al., 1996; Lobos and GarĂn, 2002). In Chile they are spreading at a rate of 3.1-3.9 km/year through both overland migration and the use of irrigation canals in agricultural areas (Lobos and Jaksic, 2005)."
Scary stuff from an ecological standpoint.