isting ▁of ▁two ▁chemical ▁comp ounds : ▁Dim eth yl ▁dis ulf ide ▁and ▁Dim eth yl ▁tr is ulf ide ). ▁This ▁attract s ▁nest m ates ▁which ▁then ▁start ▁to ▁investigate ▁the ▁injured ▁nest mate ▁and ▁pick ▁her ▁up . ▁By ▁carrying ▁these ▁injured ▁an ts ▁back ▁they ▁reduce ▁their ▁mort ality ▁by ▁ 3 2 % ▁to ▁close ▁to ▁zero . ▁Inside ▁the ▁nest ▁the ▁cl ing ing ▁term ites ▁get ▁removed . ▁In ▁case ▁they ▁lost ▁one ▁or ▁two ▁legs ▁the ▁an ts ▁adapt ▁to ▁a ▁four ▁or ▁five ▁le gg ed ▁lo com otion ▁to ▁compens ate ▁for ▁it , ▁allowing ▁them ▁to ▁reach ▁running ▁spe eds ▁similar ▁to ▁a ▁health y ▁ant . ▁These ▁injured ▁an ts ▁are ▁then ▁capable ▁again ▁of ▁performing ▁col ony ▁tasks ▁and ▁are ▁even ▁observed ▁in ▁future ▁ra ids ▁against ▁term ites . ▁A ▁model ▁calculated ▁the ▁value ▁of ▁this ▁rescue ▁behaviour ▁to ▁allow ▁a ▁col ony ▁to ▁be ▁ 2 8 . 7 % ▁larger ▁than ▁a ▁col ony ▁that ▁would ▁not ▁show ▁this ▁behaviour ▁( due ▁to ▁the ▁energy ▁saving ▁by ▁not ▁having ▁to ▁replace ▁the ▁injured ▁workers ▁with ▁new ▁health y ▁rep lac ements ). ▁This ▁is ▁the ▁only ▁in verte br ate ▁species ▁known ▁to ▁show ▁such ▁a ▁behaviour ▁towards ▁injured ▁individuals . ▁ ▁The ▁rescue ▁behaviour ▁is ▁also ▁limited ▁to ▁only ▁light ly ▁injured ▁an ts ▁( loss ▁of ▁ 1 - 2 ▁lim bs ), ▁heavily ▁injured ▁an ts ▁( that ▁have ▁lost ▁ 5 ▁lim