▁bomb ▁and ▁scratch es ▁L ester ▁on ▁the ▁che ek , ▁Gro ver ▁was ▁able ▁to ▁reason ▁with ▁it ▁as ▁the ▁St rix ▁states ▁that ▁it ▁was ▁sent ▁by ▁Emperor ▁Cal ig ula ▁to ▁kill ▁them . ▁Under ▁the ▁advice ▁of ▁the ▁Ar row ▁of ▁D ard ona , ▁Meg ▁and ▁Gro ver ▁grew ▁st raw ber ries ▁to ▁dist ract ▁the ▁f lock ▁of ▁St rix ▁so ▁that ▁they ▁can ▁get ▁away . ▁Other ▁St rix ▁appeared ▁on ▁the ▁Julia ▁Dr us illa ▁Y ach ts ▁where ▁Cal ig ula ▁uses ▁them ▁as ▁surve ill ance . ▁Cal ig ula ▁replaced ▁the ▁Germ ani ▁with ▁St rix ▁and ▁P and ai ▁because ▁the ▁Germ ani ▁are ▁responsible ▁for ▁his ▁mort al ▁death . ▁ ▁St ym phal ian ▁Bird s ▁– ▁A ▁f lock ▁of ▁birds ▁once ▁attacked ▁Camp ▁Half - B lo od ▁in ▁The ▁Sea ▁of ▁Mon sters . ▁Per cy ▁and ▁An nab eth ▁used ▁Ch ir on ' s ▁music ▁to ▁sc are ▁them ▁so ▁Apol lo ' s ▁cabin ▁could ▁shoot ▁them ▁down . ▁A ▁f lock ▁of ▁St ym phal ian ▁Bird s ▁attack ▁the ▁Ar go ▁ 2 ▁in ▁The ▁House ▁of ▁H ades . ▁In ▁The ▁Dem ig od ▁Files , ▁Ph ob os ▁summ ons ▁them ▁to ▁fight ▁Clar isse ▁after ▁he ▁ste als ▁A res ' ▁war ▁ch ari ot . ▁ ▁Tele kh ine ▁– ▁Dog - fac ed ▁sea ▁dem ons ▁that ▁ref org ed ▁K ron os ' s