iving ▁people <0x0A> </s> ▁C FA E ▁may ▁refer ▁to : ▁▁ ▁complex ▁fraction ated ▁at rial ▁electro gram , ▁a ▁recording ▁of ▁the ▁elect rical ▁signals ▁of ▁certain ▁ab normal ▁heart ▁conditions ▁ ▁Council ▁for ▁Art ▁Education , ▁Inc . <0x0A> </s> ▁Ab ed us ▁is ▁a ▁genus ▁of ▁giant ▁water ▁bugs ▁( family ▁Bel ost om at idae ) ▁found ▁in ▁fresh water ▁habit ats ▁in ▁southern ▁United ▁States , ▁Mexico ▁and ▁Central ▁America . ▁Sometimes ▁called ▁f ero cious ▁water ▁bugs , ▁these ▁brown ▁insect s ▁typically ▁are ▁between ▁ ▁long , ▁although ▁the ▁d war f ▁species ▁A . ▁imm ac ul atus ▁( syn . ▁A . ▁cant ral li ) ▁only ▁is ▁about ▁, ▁making ▁it ▁the ▁smallest ▁North ▁American ▁bel ost om at id ▁and ▁possibly ▁worthy ▁of ▁separation ▁in ▁its ▁own ▁genus . ▁Otherwise ▁the ▁different ▁Ab ed us ▁species ▁are ▁very ▁similar ▁and ▁can ▁often ▁only ▁be ▁separated ▁with ▁a ▁mic ros cope . ▁They ▁will ▁b ite ▁in ▁self - def ense , ▁which ▁is ▁pain ful ▁but ▁not ▁dangerous . ▁ ▁Be havior ▁M embers ▁of ▁this ▁genus ▁generally ▁do ▁not ▁fly , ▁and ▁at ▁least ▁some ▁species , ▁including ▁A . ▁her ber ti , ▁have ▁a ▁greatly ▁reduced ▁flight ▁appar atus ▁and ▁are ▁completely ▁flight less . ▁Despite ▁being ▁essentially ▁aqu atic ▁Ab ed us ▁may ▁travel ▁some ▁distance ▁over land ▁and ▁have ▁been ▁known ▁to ▁abandon ▁streams ▁after ▁heavy ▁ra inf alls , ▁allowing ▁them ▁to ▁avoid ▁being ▁swe