Nature's Great Events is a series of films that look at how seasonal changes cause shifting weather patterns and ocean currents, which in turn create the conditions for some of the planet's most spectacular wildlife events. Each episode focuses on the challenges and opportunities these changes present to a few key species. We see the impact of the melting of the arctic ice in the summer, the annual return of the salmon, the impact of the migration of wildebeest on a pride of lions, the annual winter sardine run along the coast of Africa, and the great feast in the ocean when the plankton blooms; amongst others...