TheYenzi(Swallow)CliffandtheBianfu(Bats)CavearefamousscenicspotsalongthesametrailintheRueiliarea.Asthenamesuggests,batsandswallowsareoftenseenonthetrail.Alongthetrailarebothoriginalforestandplantedbambooforest.TheKezilinBrookcutsthroughthevalley,makingthisareaanideahabitatforvariousspeciesofbirdsincludingwoodpeckers,MullersBarbet,White-throatedFlycatcherWarblerandsoon.Sincethetrailwindsthroughtheforest,youcaneasilyseethedancesofthesebirdsaslongasyoukeepfrommakingloudnoisesthatscarethemaway.TheChiennian(Millennium)BatsCaveisacollectionofcavesonacliffthatshootsseveralhundredmeterstallandstretchesfortwohundredmetersinlength.Thethousandsonthecliffisapopularwonder,andhousevariousbats.ThisspotissometimescalledTaiwansDunhuangCave.