The Lost Valley

Seeing as it's Lady Lara Croft's birthday, I thought we'd take a special look at the Dinosaur-packed Lost Valley level of the original Tomb Raider.

Whilst exploring a large cave complex near Vilcabamba, Peru (killing some wolves along the way, naturally), Lara heads through into the Lost Valley itself - a beautiful, exotic area full of lush vegetation, one of the most visually striking areas of the game.
We have no time for sightseeing, however, as Lara is soon beset by a pack of hungry Velociraptors!

                                                                  Lara defends against a Raptor
The Raptors Lara comes across were fast, agile hunters. They had a large, sickle-like claw on each foot, which could be moved independently of the foot itself. These claws were used as weapons, for puncturing the hardened skin of, and latching onto their prey, in a similar way to a lioness using her large canine teeth to hold onto the throat of a zebra or Antelope that the pride have caught. But the claws also had another function - they enabled the raptor to climb trees and rocks with relative ease, which is probably a major factor in the success of the Dromaeosaurids (raptors). They were also intelligent, and probably hunted in small packs...So Lara was very lucky to have survived being ambushed by them in the Valley.
One major difference between the in-game Raptors and their real life counterparts, however, is that it is now believed that all Raptor species had feathers, and were early ancestors of modern day birds. Maybe this could explain why the crows in Tomb Raider II had such a vendetta against our girl...

The fast, agile raptors are no match for Lara, however, as she uses her  wits (and pistols!) to take them out after a rather tough battle.
As Miss Croft presses further on into the valley, the ground itself begins to tremble. She barely has time to wonder what could be causing it before a HUGE T-Rex comes around the corner, and it looks like Lara is back on the menu! :O

                                                                       Look out, Lara!! A T-Rex appears from nowhere!

The Name Tyrannosaurus rex means "King of the Tyrant Reptiles" - and this says it all.
At 40 feet in length and up to 15 feet in height, T. Rex is not just THE most iconic Dinosaur, it was also one of the largest land carnivores of all time. Incredibly, it is thought that this beast could run at speeds of up to 40km/h, Typically preying upon Hadrosaurs and Ceratopsians, T.Rex was also a scavenger, and would likely feed upon any uneaten prey left by other carnivores. So when Mama Rex sees Lara in the Valley, it is definitely thinking it has stumbled across an easy meal. Fortunately for us, Lara's a tough gal. :D

She runs for a small cave to the side, and juuust about manages to get inside safely before she becomes a snack for the valley's apex predator. From the safety of her hiding place, Lara is able to take out the gigantic toothy menace with her trusty pistols.

(Note: If she wasn't attempting to save the world from a megalomaniacal Atlantean Queen, I'm sure Lara would have reported this incredible scientific discovery to the relevant institutions :P)

Real T-Rex skeleton on display at the Field Museum, Chicago

                                                   
So is it possible that the Lost Valley could exist, and sustain the Dinosaurs that live there?
In the in-game world, definitely! The wolves have access beyond Vilcabamba, and would bring back prey to their den. The Raptors would then use their long claws to climb over the rocks, and either steal the food from the wolves, or just catch the wolves themselves, returning to the Valley with their catch, then in turn, have their meals cheekily scavenged by the Tyrannosaur. And of course, when She got hungry, Mama Rex always had those Raptors to catch...until Miss Croft came along and spoiled the Dino party! :D
In the real world though, of course, it's improbable that Dinosaurs have survived the extinction event at the end of the Cretaceous Period and lived to the modern day. The closest we will probably see are large reptiles like Crocodiles/Alligators, and the Komodo Dragon of Indonesia.

So while it's unlikely that a real Lost Valley exists, if it did, there's only one person who could survive the prehistoric perils... Happy Birthday, Lara. <3

Sauropods and Titanosaurs

Welcome Back!
This time we'll be looking at the Largest family of dinosaurs, the Sauropods.
These behemoths were not just the biggest dinosaurs, but also the largest land animals to have ever lived, absolutely dwarfing the largest land animals of today.
In basic terms they are very much like giraffes, in that the have elongated necks in order to reach the succulent leaves at the top of trees, and move in herds. But being dinosaurs, of course they are Much bigger.
The diplodocus is one of the most famous sauropods, probably due to the magnificent specimen kept in the main hall of the Natural History Museum in London. (below)

                                                     Diplodocus at the NHM, London. Image by Jasmin C
This amazing creature was, at over 100ft long, and weighing in at up to 40 tonnes, an incredibly large lizard. You may have noticed, the majority of it's length was made up by the incredibly long neck, and tail. (earning the species it's name - Diplodocus meaning "Double Beam" in latin).
As mentioned above, the long neck evolved in order to reach the fresh, nutrient-rich leaves at the top of
trees - As you can imagine, an animal this large needs a lot of nutrients in order to survive the harsh prehistoric conditions.
Diplodocus' would also use their necks in order to engage in battle with others of their species, whether conflict arose over mating rights, territory, or even position within the herd hierarchy.
But there was also another weapon, making the Diplodocus deadly from either end:- The incredibly long, thin tail. Used partially for balance, Diplodocus could also whip the tail at a great speed to attack any predator that came looking for a meal.Yes, even a lizard of this size would be vulnerable to a pack of hungry raptors or, worse yet, Allosaurs looking to pick off a youngster.

Another well known Sauropod Dinosaur was Camarasaurus, an ancestor of Diplodocus. It was smaller than Diplodocus, but you can see from the picture below how the Sauropods began to evolve into their massive sizes.

                                                      Camarasaurus at NHM, London. Image by Jasmin C
And yet, Diplodocus and Camarasaurus were far from being  record holders in terms of size. Later, during the Cretaceous period, a sub-group of Sauropods would evolve to truly dwarf any other creature that has ever set foot on land - The Titanosaurs.

The Titanosaurs were truly remarkable, for subtle differences in their anatomy enabled them to grow much larger than other sauropods. Their necks were more flexible than those of more primitive Sauropod species, instantly gaining more height over their brethren.

Combined with longer front legs, this also helped to make the neck (a vulnerable spot) harder to reach for 

predatory species, vital in a time when predatory dinosaurs were also becoming larger.

To put this size into perspective - the largest Titanosaur species would often weigh in at 90-100 tonnes, twice the weight of the Diplodocus, or to put in modern terms,TEN TIMES the weight of the largest recorded African Elephant. This makes these giants among the heaviest animals to have ever lived, comparable in weight to many large whales of today, and truly deserved the name "Titans".

                                                  Argentinosaurus. Image by Capt. Kodak

Among the best known Titanosaurs are Saltasaurus and Argentinosaurus but the Title of largest 

Dinosaur, and therefore largest land animal of all time, goes to....*drum roll*...

Amphicoelias!

Only known from one fossil, and notes of bones that have been lost, Palaeontologists have been 

able to determine that this species was possibly up to 200ft in length, and weighed over 130 tonnes.

 

Now that we've looked at the larger species, next time we will look at the smallest dinosaur species.