I have read of cases of males getting the implant.
If I knew more about it (and have the money), I would definitely think of implanting Mr Darcy and Bubu who has become a little monster, biting me mercilessly... Drawing blood actually.

Have you given them the long nights treatment? If you did and it failed, you can give them the "3 days of nonstop bright light" treatment to see if it helps.

You know what? I will need to do that for Trilly after the implant ; I will do Bubu too. Thank you for reminding me! I had forgotten completely the all-light treatment.

EDIT: they are in the dark 14 hours minimum in the bird room, plus a nap at about 4.30pm