内容简介
Themonarchbutterfly,oneofthemostseeminglydelicateofallofnature'sanimals,provestobeoneofthetoughestinthisreader.MakingtheyearlytripfromtheNorthernUnitedStatesandCanadatotheOyamelforestofMexicoisnoeasytask,andittakesfivegenerationsofbutterfliesinordertodoso.Battlingcoldtemperaturesandthethreatofstarvation,thesebeautifulinsectscompleteanalmost3,000milejourneyoverthecourseoftwomonths,onlytohavetoturnandaroundandheadbackhome.