id probably go with netting. I don't have any personal experience with bird deterrence for ponds. I did see a documentary where they had to protect some medium sized birds (ducks??) from eagles and falcons. they didn't use the smallest mesh for nets but one that was just big enough to let the protected birds get through and just a bit too small for the predatory birds to get though safely. it has been a long time since I saw that episode so I don't remember just how big the netting was but it worked well for them.
though the plastic pond defender does sound like it could also work.
Kigurumi (F) yellow PK 7/4/13, Kurama VT 9/8/13, Zeydalus Salamander EE PK 21/3/14, Ryuk turquoise dragon DeT 8/5/14----Crested Gecko (8ths old) Sven Cal 27/12/11,
RIP: Osiris copper DT, Nel blue VT, Nelliel turquoise grizzle DT, Zaku red cambo, Blitzkreig Pineapple CT, Halloween orange chocolate DeT, Grimmjow, turquoise green CT
Last edited by nel3; 04-04-2014 at 10:56 PM.