71 million years ago, a young Albertosaurus, a relative of T. rex, 71 million years ago, a young Albertosaurus, a relative of T. rex, must prove herself in a deadly hunting pack or face starvation. Today, must prove herself in a deadly hunting pack or face starvation. Today, paleontologists in Canada uncover her remains, using their evidence paleontologists in Canada uncover her remains, using their evidence to reveal her battle for survival. to reveal her battle for survival.