Yard Bird

Yard Bird (チョイナー7号) started out as one of the villains of the day for the episode, The Case of the Bogus Billionaire. A hyperactive and very fast ostrich (though they are sometimes referred to as a roadrunner) that appeared in only a few episodes, mainly as the Big Cheese's delivery person. They have a design defect that causes them to explode if they stop moving for more than two seconds.

Their gender changes depending on the episode.

Trivia

 * In KNT, the character was modeled after Jackie Joyner-Kersee (Japanese reading Jakkii Joinaa-Kaashii, Choinaa rhymes with Joinaa), the Olympic gold medalist, while their English name is derived from the famous 1960s English rock band The Yardbirds (which is itself derived from the nickname of jazz legend Charlie Parker).