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This article was produced by National Geographic Traveller (UK). Seeing any animal in the wild is a privilege — but seeing huge numbers is something else. For a start, it’s both humbling and heartening to encounter any species in abundance. It’s also genuinely exciting. When big groups of creatures seasonally cluster in one place, there’s always something to watch — from courting and mating to fighting or family-raising. It may be a sensory assault, too: noise, tumult, pungent smells, crashing waters, mad flurries of dust. And where masses gather to move together, hungry predators may lurk, adding a macabre but fascinating dimension. Here, we’ve picked the most dramatic migrations through the year and around the globe. Monarch Butterflies, MexicoWhen to go: December to MarchHow does an insect the weight of a paperclip make a journey of 3,000 miles? That’s the feat of the extraordinary monarch butterfly, which somehow flutters from its summer breeding grounds — spread across Canada and the American northeast — to a patch of oyamel fir forest in the highlands west of Mexico City.