Nigel isn't having much luck getting the cave bear to stop chasing him. He may be fast, but most large mammals are faster than even an Olympian could run.

Fortunately for Nigel, there is one advantage he has over the cave bear: he can climb trees.

Nigel quickly climbs up one of the trees, getting very high up. His crew follows suite, and everyone is soon out of the cave bear's reach.

When it arrives, the bear tries to climb, but quickly gives up. It then tries to shake the crew out of the tree, but they refuse to let go. Having failed to force them out, the bear leaves.

Once it is far enough away, the crew leave the trees and make sure everyone is accounted for.

"That was terrifying. And surprising. That was a cave bear. They should have gone extinct thousands of years ago, but it looks like this one's managed to hold on against the odds."

The crew trek back to the cave, where the bear is returning, presumably to hibernate.

This cave bear could be the very last of his kind. For Nigel, that means only one thing: he needs to be saved.

Nigel gets to work setting up the portal. Additionally, he gets out some berries and meat, for bait.

"Cave bears are far more herbivorous than most modern bears, but they'll never turn down meat, so I'll use the meat and the berries to bait it through. The portal carries odors through it, so I'll rub the meat across the ground, then throw it through. The berries will be to bait it out of the cave."

Nigel activates the portal, then starts his plan. He rubs the meat against the ground, to imitate a wounded, limping animal, and then throws it through the portal. Then, he makes a berry trail, going from the first blood spot up to the mouth of the cave. Finally, after backing up to a safe distance, he throws a rock into the cave.

Soon, the bear emerges once again, this time curious and hungry. It begins eating the berries, then follows the blood trail to the portal. Though it seems reluctant at first, eventually, hunger proves to be the greater motivator, and it heads through the portal.

-

In the present, Bob is dealing with the new arrival.

Bob is just outside of a holding pen. Within is the cave bear and Susan.

"Now, normally, I'd be angry about Nigel's unwanted rescue, but this feller just came into one of the pens and fell asleep. I think he's trying to hibernate. Whatever the reason, he's doing fine and it gave Susan the chance to examine him in peace."

For now, it seems the cave bear is not going to be a hassle.

-

Back in the past, Nigel has finally found mammoth sign.

Nigel has found a set of large, round tracks

"These are just like elephant tracks in Africa and Asia, so these must be mammoth tracks. And (approaches a large, odd brown thing) more: this is mammoth dung. It's just like elephant dung, but it's mostly leaves in here. Mammoth's are built for eating grass, so this isn't a good sign about the mammoth's eating habits. But, the most important thing is, it's warm, so the mammoth can't be far away."

Reinvigorated by his discovery, Nigel continues to search for a mammoth.

Eventually, he finds what he's looking for. But it comes with a shock.

Nigel comes onto an open field of snow. On it is a pair of mammoths. One of them, though, isn't moving. The other seems desperate to get some reaction from the other.

"There's two mammoths: probably females, but one isn't moving. The unresponsive one, she's in a pit with sticks, I need to get closer to see what happened."

Nigel gets in closer and confirms the worst.

"The mammoth that's in the pit, she's dead. She's in a trap."

It seems ice age hunters have beaten him to his target.

"Some hunters must have dug up that pit, then filled it with sharp sticks. When the mammoths came by, the one that fell was speared to death. The other one, she stayed behind to defend her herd mate. (Mammoth makes a low grumble) This is just heart breaking. The female, she's making these low grumbling noises from her stomach, elephants do it today. She's trying to get a reaction out of the fallen one. She won't get an answer, of course."

Eventually, the living mammoth collapses. She isn't dead, not yet, but she's getting there.

"This female, I think the dead one is her sister. She must be really sick right now: she can barely lift her trunk, she can't stand, her ears are too close to her body and she's wheezing. She has an injury on her shoulder blade, I think it came from a spear tip."

Now, Nigel is faced with a greater dilemma: the mammoth is too weak to leave, but if he goes back to the present for help, then the hunters may return to finish the job.

Eventually, Nigel calls in his team, who were scouting nearby, and informs them of the situation. From there, they'll have to formulate a plan.

-

In the present, Bob is having his own problem. And it isn't related to the cave bear.

"One of the little dinosaurs Nigel rescued, it's out of its exhibit. The little guy is what's called an Alverezsaur: small, chicken like dinosaurs that only had one functional finger. Now, he's are bug eater, but I can't find him near any of the bee, ant, wasp, or termite nests, or anywhere else for that matter.

Unknown to Bob, the little dinosaur isn't interested in the insects. His sense of smell has led him to a different food source.

A tiny, maroon colored dinosaur stands in front of the sign of an exhibit with very large fencing. The words on the sign?

'T. rex Hill'

-

And done!

Notes:
1. Cave bears actually are mainly herbivores.
2. The alverezsaurs were the ones nearby the rex nest.
3. If you can think of anyway to right the last [art better, tell me, even I think it was poorly written.