Lost World: Rise of the Ancients mod for Half-Life 2

Brazilian developers seeking to expand into the Amazon in the hope of building a new city in a recently authorized site west of Manaus, during the clearing process they unknowingly destroy a natural barrier that untill now had kept a "Lost World" of ancient creatures contained from the rest of South America. A decade has passed and the city is now well under construction with several thousand residents already living in the new city of Egesea.

The creatures, having roamed free unoticed underwent a population boom, the native wildlife, unable to cope with the prehistoric beasts have fallen prey to the smaller Dinosaurian predators, who in turn feed the giant super-predators. The Herbivores that were contained in the lost world also flourished, feeding on the new, rich vegetation that is now available to them, they were the first to be seen by the residents of Egesea. News spread fast, only to be shot down as a tabloid rumor. Then the predators arrived, having followed the herbivores.

The predators had completely encircled the city to avoid going into the strange environment, but they quickly learned that food was easy to be had inside the city and began hunting the people living inside. An evacuation was commenced, but 6,000 people were left behind, the police and military forces unable to reach them though the overpopulated carnivores now roaming the city.

In desperation, they appeal to Britan and the United States for help.

The player gets the opportunity of becoming one of the most ferocious predators of prehistoric South America, or a struggling human survivor of a horrifying disaster of the likes mankind has never known.

As a Dinosaur, your goal is to feed on as many people as you can find, while not falling prey to another larger Dinosaur or shot down in a hail of gunfire.

As a Survivor, you will be on the run, constantly trying to avoid the horrors that await you outside in the jungles and the city streets of Egesea and escape before you are all eaten alive.

As British/US Army soldier, you must rescue the surviving civillians before they are all killed by the beasts that have invaded Egesea.

Features:
-Realistic weapon handling system with Iron sights
-Uniquly designed Dinosaur attacks allowing the freedom of grabbing your victim with your hook-like claws to carry them off and tear them apart with a set of serrated teeth.
-Realisticly created Dinosaur models such as :
Gigantosaurs
Tyrannosaurs Rex
Velociraptor
Edmarka Rex
Dilophosaurus

-Over a dozen firearms to find in each map.
-Unique game modes such as "Evacuation", where you must save more survivors than the Dinosaurs can kill, and "Escape", where you have to escape through a thick and deadly jungle and back to Egesea before you all prey to the predators that dwell in the jungle.