Deep in the forests of Mexico, millions of monarch butterflies spend their winter sheltered from the cold. Once spring arrives, it is time for them to awaken and take to the skies, in what is truly an amazing spectacle. Subscribe: bit.ly/BBCEarthSub #AnimalMigration #Butterflies #Hibernation Watch more: Best of BBC Earth 🌍 bit.ly/BestOfBBCEarth Best Animal Fights 🥊 bit.ly/BestAnimalFights Videos over 10 minutes ⏰ bit.ly/3SHJCEJ Planet Earth III 🌍 bit.ly/PlanetEarthIIIPlaylist Frozen Planet II ❄️ https:/bit.ly/FrozenPlanetIIPlaylist Blue Planet II in 4k 🌊 bit.ly/BluePlanetII4kPlaylist Taken from 'Earth's Great Seasons' (2016). The BBC's Natural History Archive celebrates the extraordinary nature of the four magnificent seasons on Planet Earth, and how animals and plants rise to the new challenges they bring. In each episode, we visit a different season, each with its own magical and dramatic personality, and reveal how different a...