Canadian Natural Res (NYSE:CNQ) reported quarterly earnings of $0.51 per share which missed the analyst consensus estimate of $0.66 by 22.26 percent. This is a 20.31 percent decrease over earnings of $0.64 per share from the same period last year. The company reported quarterly sales of $6.284 billion. This is a 19.06 percent decrease over sales of $7.764 billion the same period last year.