Hunters.        
Hunters scavenge for a scarce supply of food.
Hunters roam the land, seeking survival.
Hunters devour their prey, starting a feud.
Hunters travel for miles, attacking their rivals.

Disaster.
Disaster spreads across the sky filled with debris.
Disaster leaves specialists to solve a mystery.
Disaster causes the population to flee.
Disaster develops the landscape of their history.

Savages.
Savages tears apart their counterparts.
Savages flees the plains in disarray.
Savages becomes beastly at their heart.
Savages rely on betray.

Climate.
Climate boggles the brains of creatures.
Climate alters the temperature of the land. 
Climate affects the earth and land features.
Climate serves as God enforcing their spirits to be damned.

Extinction.
Extinction curses the creatures to vanish from this earth.
Extinction fulfills the cycle of life for dinosaurs.
Extinction leads experts to answer the questions since their birth.
Extinction allows us to remember their roars.