In a world governed by the ebb and flow of the seasons, animals need a strategy to survive. Where some wait out the harder times, others need to hit the road in search of greener pastures. The great wildebeest migrations see millions of beasts moving in unison- chasing the rains, chasing the sunshine, chasing sustenance. Meanwhile, off the coast, seasonal events open a passage for recently spawned sardines - this episode allows us to witness a true feat of nature as billions of fish are pursued by millions of predators as they make their way up the coast. Bear witness to some of the greatest migrations on earth