You're not going to like hearing this, but Looney Tunes cartoons might NOT have been scientifically accurate.

You know how Wile E. Coyote could never catch the Roadrunner? That's dead wrong.  Coyotes are actually more than TWICE as fast as roadrunners. Coyotes max out at 43 miles-per-hour, roadrunners max out at 20 miles-per-hour.

Also, Roadrunners generally don't have unlimited access to falling anvils.

(Mashable)