Drew heard Cynthia cry out his name and tackle him to the floor. Drew looked at her, confused, "What on Earth did you do that for?" His question was answered when, suddenly, he heard a throaty growl. Following the noise, he turned to see the visage of the largest crocodile he had ever seen; from nose to tail, it must have been thirty feet long. Its head was about five feet long, with a long, narrow snout, a mouth filled with large, pointed teeth, and a rounded bulb-like structure at the end of the nose, like a gharial. Its twenty-five-foot long body was covered in sandy yellow scales, with slightly darker armour plates along its back, ending in an incredibly long, powerful-looking tail. The crocodile roared at them and stamped its foot; the message that they were not welcome on its turf was clear. After a few minutes, Drew, Cynthia and Leon silently moved away, keeping a respectful distance from the giant. Leon knew what it was immediately. "Sarcosuchus", he whispered, "One of the largest crocodiles that ever lived; there's evidence that it ate dinosaurs."

Suddenly, they heard more growls and snaps coming from the river; three other Sarcosuchus, slightly smaller in size than the giant emerged from the river, curious as to these new arrivals. These were clearly females, whilst the individual that they had encountered was the male; this was a breeding group. Drew, Cynthia and Leon looked at the four crocodilians, formulating plans. How were they going to get this lot back through the portal? It was clear that they were not going to move any time soon, and approaching them would probably be pretty risky.

However, their territoriality gave Drew an idea. "Leon, grab the air horn", he said. Leon looked at him, puzzled and said "Why?". Drew smiled and said "Trust me". Leon's eyes widened in realisation and, grabbing the air horn, he began blaring it at the Sarcosuchus. The gigantic crocodilians, their attention turned to the three humans, let out low, indignant bellows at them. As, the four Sarcosuchus charged through the portal, into the present. Shortly after this, Drew's communicator rang. Picking it up, Drew said "Hello?", before turning to Cynthia and Leon and saying "It's Jack."

Meanwhile, in Brazil, Jack, Adrian and Alice had reached the outcrop. It looked more impressive in close-up. Over thousands of years, erosion had carved the dark rock into a series of spectacular pinnacles. Hundreds of small pinnacles were mounted on taller outcrops, which in turn built onto the highest rocks, towering into the air. Among the rocks, large blowholes periodically sent spouts of water up among the pinnacles. The waves made a constant dull booming as they rushed along the tunnels and caves carved out beneath the mountains.

As they approached, the pinnacles erupted into life. Several hundred medium-sized pterosaurs were sitting on the rocks, letting out loud, cawing cries, like a crow. Each pterosaur was covered in short, black fur, with a fifteen-foot wingspan; however, what made them unique was their crests. In the males, a hard sail of bone and keratin arose almost three feet above each's head. Each male was vigorously displaying to the smaller females, with smaller crests. Jack, Alice and Adrian looked at each other; they knew this was Tapejara. How were they going to get this lot through the portal?

Suddenly, a lone pterosaur appeared, gliding effortlessly on the updraft from the waves, slipping from one swell to another with no perceptible movement of its wings. As it moved closer, Jack, Alice and Adrian could discern aspects of its features. The newcomer was light grey on top with a black, flecked pattern breaking up its outline. It had a long yellow beak, with interlocking, conical teeth and a wide, keel-like crest on the end. However, its most distinctive feature was its size. From wing tip to wing tip, its wingspan must have been forty feet long. The Tapejara were fairly large themselves, but the new arrival made them look tiny.

The Tapejara were getting nervous; their calls becoming more and more frantic as the newcomer passed over them. It paid them no attention, before veering elegantly towards a wide-open shelf area behind the outcrop. The giant stalled its flight and hung, briefly, in the air before it pulled in its wings like a bat and rolled over and lifted itself up on its little wing claws. It looked back at the chaos of the Tapejara displaying area before giving out a series of low, throaty clicks. Jack, Alice and Adrian looked at each other; they all knew this was Ornithocheirus.

Jack raised his communicator, "Drew, we've found a giant Ornithocheirus. Is he something to do with why we have the Cessna?" Drew's voice crackled in from the other side, "Bingo! Before he started planning the missions, Theodore scouted out everywhere he wanted to go and observed the animals intently. He found that Ornithocheirus, no matter where they are, head to an island called Cantabria to breed. Put a tracker on him and you can follow him there." Alice snuck up to the gigantic pterosaur and, quietly as she could, attached a small tracer on his left ankle. The Ornithocheirus turned round, reared to his full intimidating height and hissed at her, but, after she ran back to Jack and Adrian, he ignored her.

That done, they turned their attention to the Tapejara. Using bait and recordings of their calls, they were able to lure some of the Tapejara through the portal. After the first few, they got a bit risky; Adrian nearly slipped off a geyser luring a male through the portal. They continued with this for an hour, until they had sent a sufficient amount of the pterosaurs through the portal, after which they returned to watch the Ornithocheirus.

After several hours, the Ornithocheirus rocked back on his legs and extended his wings, flicking out his long wing fingers. In an instant, he leant into the breeze and gracefully jumped off the granite shelf. He immediately started to climb, rising above the remaining Tapejara as he banked into a tight circle and soared higher and higher.

Jack, Alice and Adrian rushed back to the Cessna and go it ready for take-off. As Jack took the wheel and the plane's engine whirred into life, they recapped where they were; they could track the Ornithocheirus' every movement and the Cessna could maintain his pace. The chase had begun.

With Jack, Alice and Adrian on the chase, Drew, Leon and Cynthia were now searching along the lake. After a talk, they had decided to use the lake as a base camp; on dry plains, watering holes were important. They were searching around the lake for signs of Argentinosaurus. However, as of now, they were unsuccessful. However, this all changed when, on the lake's north shore, the team found something. The landscape on the western shore of the lake was pockmarked with holes; holes that had been dug and reburied continually over time. Reaching into the nearest, Drew, Cynthia and Leon found large eggshells; judging from the fragments each egg was probably about the size of a grapefruit. Leon knew what they were immediately, "These are Argentinosaurus eggs! They must use the lake as a nesting site!"

Cynthia cocked her head, "So we just stay here and wait until they arrive?" Leon briefly paused and said, "Ah. There might be one problem with that; the nesting season might have passed." Drew looked at both Cynthia and Leon and said, "If that's the case, we search round the immediate area for any signs of Argentinosaurus; if we don't find anything, we return to the lake. For this we'll split up; one of us will take a glider, whilst the other two will take the Jeep."

Leon said, almost immediately, "I'll take the glider and you guys can take the Jeep". Drew raised his eyebrows curiously, "Why?" Leon's reply was almost inaudible, "Because I'm sick of being the third wheel." After saying that Leon went to get the glider, whilst Drew and Cynthia got the Jeep ready. The search had begun.