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In the park, the dinosaurs are settling in. The Tyrannosaurus rex are being fed. Nigel goes to visit a herd of African elephants in the park: there are at least four including a young calf. He now wants to rescue a woolly mammoth from extinction. He goes through the Time Portal to 10,000 BC northwest Siberia just east of the Ural Mountains where the last mammoths lived. It is early spring but the land is still under snow. He drives a snowmobile over a frozen lake. He sees nothing but dense taiga forest and rocky mountains: as the land became warmer as the Ice Age ended, trees replaced tundra grass and mammoths lost their grazing lands. As they cannot eat pine needles, this reduced their numbers. Then prehistoric Cro-Magnon humans finished them off by hunting them for food. He explores a nearby cave and comes face to face with a muscular male cave bear; he had disturbed its hibernation. He had thought that the cave bear would already be extinct by this point. It chases Nigel and the cameraman away. Without the equipment to transport it safely, Nigel cannot save it, so he decides to get back to saving a mammoth. Nigel goes up a rocky slope to scout the area. He sees what a gap in the trees: it may be open land, and perhaps there are mammoths there. He decides to check. He finds two adolescent female mammoths. The older mammoth is dead in a pit. The younger mammoth makes rumblings in her stomach, trying to communicate with her dead companion. She looks ill. She staggers and falls to the ground. She is so weak that she can barely lift her trunk. She is staying with the fallen mammoth; they may be sisters. Nigel sees a spear wound in her left shoulder. He brings in his team to help. In the park, the Ornithomimus are not eating the grass, nor the beetles living there. Bob realises that they have duck-like mouths: rough likesandpaper. He decides to put them into an enclosure with a pond. The Ornithomimus thrive in their new home. Nigel needs to get the mammoth strong enough to walk through the Time Portal. He gives her an antibiotic injection. Evening comes and the palaeolithichunters are back. The Park men put up a line of big burning torches stuck in the ground. The men plan to guard in turns, but Nigel decides to sit up with the Mammuthus all night, to keep her company. Wolves prowl about at a distance all night. Morning comes and the mammoth is strong enough to stand. It shows no aggression, and stays with her dead sister, but the team must get her back to the park. They set up the Time Portal. Nigel leads the mammoth back to the present and calls on a walkie-talkie for urgent medical help. In the park, Susanne gives sedative and antibiotic to the mammoth, treats the wound, and after some pulling extracts a stone spearhead from it. She is on the road to recovery. They name her Martha. Martha is healthy, but is not eating, and needs to eat for strength to recover. They put Martha in an enclosure labeled "Mammoth Mount". Suzanne looks at an African elephant molar and a mammoth molar, and sees that they are designed to chew about the same sorts of food. Maybe Martha is not eating because she needs a specific diet. To solve the mystery, Nigel goes through the Time Portal to the same place in Siberia 150,000 years ago at the peak of the ice age. Mammoths range across from Europe to northeast Asia. He finds a large herd of adult female mammoths. The land is cold but dry and has many kinds of grass and no trees. Each herd follows a matriarch, who is 50 or 60 years old. He collects a large sample of grass and mosses to bring back and analyse. A male mammoth on musth comes, looking for females ready to mate. All the mammoths are thriving on the grassland diet. He sees a sub-adult male Elasmotherium by the snowmobile. It is downwind from him. but there is a risk of it seeing him, and if it sees anything unexpected it may charge. Nigel is between the Elasmotherium and the musth male mammoth. He drops the bag of vegetation and runs to the snowmobile and drives to a safe distance. Nigel decides to bring the Elasmotheriumback, riskily using himself as bait, as Elasmotherium will soon be extinct due to climate change. Nigel runs to the sample bag. TheElasmotherium charges at him. Nigel picks the bag up and runs. The Elasmotherium chases him through the Time Portal into the entrance stockade in the park. Back at the Park, Nigel offers Martha the Ice Age grass, but Martha still refuses to eat. Whilst he admits it is anthropomorphic to say so, Nigel thinks that she looks lonely; in the wild female mammoths are always in groups. TheElasmotherium, which is accustomed to being alone, is settling in but Martha is accustomed to being with relatives. There is a council, to decide on putting Martha with the elephants. It is risky: elephant matriarchs have been known to kill new elephants that tried to push into an established herd but they decide to try it. At Mammoth Mount, the elephants come up to Martha's enclosure. Martha and the elephants' matriarch approach each other, curious, and non-aggressively. Nigel calls to open the gate. Martha follows the elephantmatriarch. Martha is now eating well.
