al ▁lo bes ▁of ▁the ▁ca ud al ▁fin ) ▁of ▁varying ▁shapes , ▁but ▁they ▁all ▁use ▁them ▁to ▁attract ▁and ▁then ▁imm obil ize ▁pre y . ▁ ▁The ▁t ass elled ▁wob beg ong ▁( E uc ross or hin us ▁das yp og on ) ▁a ▁car pet ▁sh ark , ▁has ▁a ▁ca ud al ▁fin ▁res emb les ▁a ▁small ▁fish ▁with ▁a ▁small ▁dark ▁eyes pot ; ▁this ▁is ▁w aved ▁slowly ▁to ▁attract ▁pre y . ▁ ▁Other ▁ ▁Ca ud al ▁l uring ▁behavior ▁is ▁believed ▁to ▁occur ▁in ▁pel ican ▁e els . ▁ ▁E volution ▁ ▁It ▁has ▁been ▁suggested ▁that ▁ca ud al ▁l uring ▁was ▁involved ▁in ▁the ▁evolution ▁of ▁the ▁tail ▁v ibration ▁r attle ▁of ▁r att les n akes , ▁a ▁warning ▁signal ▁and ▁a ▁way ▁of ▁aud itory ▁communication , ▁though ▁this ▁has ▁been ▁challeng ed . ▁Pre y ▁l uring , ▁in ▁general , ▁is ▁conf ounded ▁by ▁false ▁interpretation , ▁as ▁the ▁w igg ling ▁of ▁an ▁append age ▁could ▁have ▁other ▁behavior al ▁mean ings ▁including ▁a pos emat ism , ▁defence , ▁or ▁nerv ous ▁release , ▁and ▁experimental ▁evidence ▁has ▁been ▁weak . ▁ ▁Ca ud al ▁l uring ▁is ▁thought ▁to ▁have ▁evol ved ▁from ▁a ▁ca ud ally ▁local ized ▁intention ▁movement ▁( a ▁behavior ▁derived ▁from ▁locomot or ▁movements ). ▁Ess entially , ▁the ▁act ▁of ▁remaining ▁station ary ▁while ▁sens ing ▁pre y ▁produces ▁general ▁nerv ous