. ▁It ▁has ▁also ▁been ▁seen ▁that ▁no ct urn ally ▁migr ating ▁birds ▁become ▁dis orient ed ▁when ▁the ▁polar ization ▁pattern ▁at ▁tw il ight ▁is ▁unclear . ▁ ▁The ▁best ▁example ▁is ▁the ▁hal ic it id ▁be e ▁Meg al opt a ▁gen alis , ▁which ▁inhab its ▁the ▁rain for ests ▁in ▁Central ▁America ▁and ▁sc av eng es ▁before ▁sun r ise ▁and ▁after ▁sun set . ▁ ▁This ▁be e ▁leaves ▁its ▁nest ▁approximately ▁ 1 ▁hour ▁before ▁sun r ise , ▁for ages ▁for ▁up ▁to ▁ 3 0 ▁minutes , ▁and ▁accur ately ▁returns ▁to ▁its ▁nest ▁before ▁sun r ise . ▁It ▁acts ▁similarly ▁just ▁after ▁sun set . ▁ ▁Thus , ▁this ▁be e ▁is ▁an ▁example ▁of ▁an ▁insect ▁that ▁can ▁perce ive ▁polar ization ▁patterns ▁throughout ▁astronom ical ▁tw il ight . ▁ ▁Not ▁only ▁does ▁this ▁case ▁exempl ify ▁the ▁fact ▁that ▁polar ization ▁patterns ▁are ▁present ▁during ▁tw il ight , ▁but ▁it ▁remains ▁as ▁a ▁perfect ▁example ▁that ▁when ▁light ▁conditions ▁are ▁challeng ing ▁the ▁be e ▁orient s ▁itself ▁based ▁on ▁the ▁polar ization ▁patterns ▁of ▁the ▁tw il ight ▁sky . ▁ ▁It ▁has ▁been ▁suggested ▁that ▁Vik ings ▁were ▁able ▁to ▁navigate ▁on ▁the ▁open ▁sea ▁in ▁a ▁similar ▁fashion , ▁using ▁the ▁b ire fr ing ent ▁cry stal ▁I cel and ▁sp ar , ▁which ▁they ▁called ▁" s unst one ", ▁to ▁determine ▁the ▁orientation ▁of ▁the ▁sky ' s ▁polar