@pachyderm pro Well, one would assume the moat was for the Madagascar Teals that were also signed here (I didn't include them in the title) since there's no water for them in the netting, but the netting excludes the moat. The teals were in the lorikeet aviary instead, unsigned.
I can think of reasons why they might have had to net it over, I just don't know what particular reason it was.