The third instalment follows a year in the life of the Ndutu lion pride, which occupies a territory on the short-grass plains of the Serengeti. Their lives are dictated by the annual migration of one million wildebeest and zebra around the Serengeti. As the herds move north following the rains, the Ndutu pride's four lionesses and seven cubs are left behind to face the dry season without their main prey. The grass dies off leaving the lions without cover, making hunting what few animals remain even more difficult. The pride must keep moving to find food, but gradually the starving cubs weaken. A female cub and her brother, both in very poor condition, cannot keep up with the adults, and their fate seems sealed. However, when the pride is relocated the following month, the two cubs have somehow survived and been reunited with the adults. The lions face a further challenge as the active volcano Ol Doinyo Lengai erupts for the first time since 1967, raining ash down on the plains. These cyclical eruptions play a crucial role in the Serengeti ecosystem. The ash fertilises the earth, and with the arrival of the first storms, the plains become green and lush. The wildebeest herds return and give birth to their young, and the Ndutu pride can enjoy the good times again. In "Pride and Peril", the diary segment, cameraman Owen Newman's long and lonely vigil watching the Ndutu pride is rewarded with a story of hardship, loss and fortitude.
Nature's Great Events is a wildlife documentary series made for BBC television, first shown in the UK on BBC One and BBC HD in February 2009. The series looks at how seasonal changes powered by the sun 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. Nature's Great Events was produced by the BBC Natural History Unit in association with the Discovery Channel and Wanda Films. The British version of the series was narrated by David Attenborough. In the USA, the series was shown under the alternative title Nature's Most Amazing Events beginning on 29 May 2009 and was narrated by Hasani Issa. The title Nature's Great Events was previously used by Reader's Digest for a unrelated VHS series released in 1996. Source