Birdman seemingly meets his match when a mad scientist gives a young woman mechanical wings (similar to the ones worn by Birdboy) and a strength formula to create Birdgirl.
Birdgirl, from the sound of it, was voiced by Virginia Eiler (Gravity Girl). 25 years later, [adult swim] brought her back on Harvey Birdman, Attorney-at-Law, recast as the daughter of Phil Ken Sebben (Stephen Colbert, The Colbert Report). Here is Judy Ken Sebben, aka Birdgirl, trying to help Peter Potamus with an exercise.
If that was an attempt at making Birdgirl seem remotely relevant, it didn't work.
The Birdman episode merits a B.