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Description
A pack of Albertosaurus prepares to feed on an Edmontosaurus they have chased into exhaustion. As they stand over the dead animal, whose heart has given out from fear and weariness, the alpha female asserts her dominance over her mate and son. As head of the family, she gets first cut. It's also her job to make sure that it's safe to eat.
  She approaches the carcass and looks around. All seems well. She sniffs the air. Everything seems fine... until that is, she detects a scent unlike anything she's ever smelt before. It smells like a predator. She growls a warning. Her family goes on high alert. They detect the scent as well, but they don't recognize it. The smell is strange... new... alien... dangerous. She snarls a warning, her feathers ruffled. Her mate watches her back. She peers into the trees, her eyes scanning rapidly. Nothing moves. She listens closely. Silence. The alpha thinks whatever is out there is gone.
  As the female Albertosaur prepares to take a bite, a sound of quick, heavy thudding draws her attention. She barely looks up in time to see and avoid the open mouth of something big, with row upon row of enormous teeth. She retreats backwards, hissing. The three Albertosaurs are confronted by what looks like one of their own... but it isn't. It looks different. It's too big. It smells wrong. The pack's brains can't make sense of the creature. All they know is that they've never seen anything like it and it's a rival. The newcomer rears high and snarls its own threat. Its deep, guttural bellows cause the pack to back off a step. The female challenges the monster, clapping her jaws in threat and bobbing her head. The creature isn't fazed; it just stands there, unmoving. Its eyes face forward. To the Albertosaurs, that's the most unnerving part; those horrible, baleful red eyes follow all their movements. the creature itself barely moves to look around at all.
  The three hunters try to scare the monster; they outnumber it. They snarl, roar and stamp their feet, making snaps and mock charges. The monster however, is not fooled. Clearly, it knows these tactics. The new predator's own threat is not so veiled. It rushes forward and bellows, placing a foot on the Edmontosaurus. The speed the animal moves is incredible. The alpha's nerve falters and she runs, terrified. Her mate follows, their son trailing behind. They stop a short distance away. The beast watches them, and in a display of dominance, it tears the head from the carcass, crushing it and swallowing.
  The Albertosaurs watch helplessly as their kill is plundered. They can do nothing. This creature is clearly the new dominant predator of their territory, a beast to be avoided at all costs. What they don't know however is that for them, this is the beginning of the end; this monster is accompanied by others of its kind from the north. Across their range, other Albertosaurs are coming into contact with this super-predator, and they will eventually be driven extinct by competition, disease, and loss of prey. There's no room for Albertosaurs anymore, for the reign of Tyrannosaurus rex has come.

A sketch I did regarding T. rex. A new theory by Steve Brusatte and Thomas Carr indicates that Tyrannosaurus rex was likely an invasive species from Asia and a descendant of Tarbosaurus. The evidence for this seems pretty strong too, as no other tyrannosaur genera (with the possible exception of Nanotyrannus) are found within Tyrannosaurus' range. This may not be the first sketch of this interaction; that honor belongs to , but it's always fun to show just how powerful and ferocious T. rex was. It even drove out other tyrannosaurids. I also believe a lot of other animals may have followed Tyrannosaurus to America as well, furthering competition.

Description
A pack of Albertosaurus prepares to feed on an Edmontosaurus they have chased into exhaustion. As they stand over the dead animal, whose heart has given out from fear and weariness, the alpha female asserts her dominance over her mate and son. As head of the family, she gets first cut. It's also her job to make sure that it's safe to eat.
  She approaches the carcass and looks around. All seems well. She sniffs the air. Everything seems fine... until that is, she detects a scent unlike anything she's ever smelt before. It smells like a predator. She growls a warning. Her family goes on high alert. They detect the scent as well, but they don't recognize it. The smell is strange... new... alien... dangerous. She snarls a warning, her feathers ruffled. Her mate watches her back. She peers into the trees, her eyes scanning rapidly. Nothing moves. She listens closely. Silence. The alpha thinks whatever is out there is gone.
  As the female Albertosaur prepares to take a bite, a sound of quick, heavy thudding draws her attention. She barely looks up in time to see and avoid the open mouth of something big, with row upon row of enormous teeth. She retreats backwards, hissing. The three Albertosaurs are confronted by what looks like one of their own... but it isn't. It looks different. It's too big. It smells wrong. The pack's brains can't make sense of the creature. All they know is that they've never seen anything like it and it's a rival. The newcomer rears high and snarls its own threat. Its deep, guttural bellows cause the pack to back off a step. The female challenges the monster, clapping her jaws in threat and bobbing her head. The creature isn't fazed; it just stands there, unmoving. Its eyes face forward. To the Albertosaurs, that's the most unnerving part; those horrible, baleful red eyes follow all their movements. the creature itself barely moves to look around at all.
  The three hunters try to scare the monster; they outnumber it. They snarl, roar and stamp their feet, making snaps and mock charges. The monster however, is not fooled. Clearly, it knows these tactics. The new predator's own threat is not so veiled. It rushes forward and bellows, placing a foot on the Edmontosaurus. The speed the animal moves is incredible. The alpha's nerve falters and she runs, terrified. Her mate follows, their son trailing behind. They stop a short distance away. The beast watches them, and in a display of dominance, it tears the head from the carcass, crushing it and swallowing.
  The Albertosaurs watch helplessly as their kill is plundered. They can do nothing. This creature is clearly the new dominant predator of their territory, a beast to be avoided at all costs. What they don't know however is that for them, this is the beginning of the end; this monster is accompanied by others of its kind from the north. Across their range, other Albertosaurs are coming into contact with this super-predator, and they will eventually be driven extinct by competition, disease, and loss of prey. There's no room for Albertosaurs anymore, for the reign of Tyrannosaurus rex has come.

A sketch I did regarding T. rex. A new theory by Steve Brusatte and Thomas Carr indicates that Tyrannosaurus rex was likely an invasive species from Asia and a descendant of Tarbosaurus. The evidence for this seems pretty strong too, as no other tyrannosaur genera (with the possible exception of Nanotyrannus) are found within Tyrannosaurus' range. This may not be the first sketch of this interaction; that honor belongs to , but it's always fun to show just how powerful and ferocious T. rex was. It even drove out other tyrannosaurids. I also believe a lot of other animals may have followed Tyrannosaurus to America as well, furthering competition.