S1, E5: Urban fox Nelson's effete French pen friend Christian arrives for a visit, and starts behaving uncharacteristically badly - exhibiting mood swings and frothing at the mouth. Yes, it seems Christian has rabies. When pigeon Kali is caught up in a nasty pigeon cull, she resolves to take over the world and take revenge on humankind by creating the pigeox - half pigeon, half fox.