Unlike the common carp, bighead carp are primarily filter feeders. Bighead and silver carp feed by filtering plankton from the water. Bighead carp do not normally jump when frightened. Bighead carp are considered a highly destructive invasive species in the United States. Its members include tadpole gobies, monkey gobies, and bighead gobies. Communities are attempting to contain the spread of the extremely invasive bighead carp. Since February 2007, using LIVE bighead carp as fishing bait has been illegal in Missouri. Live bighead carp are also banned from sale in Canada. Another potential avenue for unintentional spread of bighead carp is through use as fishing bait. Possession of live bighead carp has been illegal in Illinois since 2005. In December 2010, the U.S. Congress banned the importation of bighead carp. The genus name "Aristichthys" has also sometimes been used for bighead carp, but is deprecated. On the farm, Utah Watkins struggles with his cattle, aided by Bessie Bighead. The entire episode "Leap Frogs", in which Bev Bighead attempts to seduce Rocko, was skipped. Bev assumes authority in the Bighead household.