Experts think they could be crucial to eliminating pests
The vandals pulled up fences, ripped up track, destroyed grassed areas and intimidated hut users.
The bird has been named Manuhiri, meaning 'visitor' in te reo Māori.
Flight restrictions in place around Mangawhai are being ignored by some.
"Nature is under attack on private and public land, and that public agencies are desperately failing."
"There will be so many fish we won't know what to do with them."
The critically-endangered birds have returned to the unexpected site in fewer numbers than last year.
"It's one of the things we have been working through and has taken a little bit of time."
The new baby is the first rhino birth at Auckland Zoo in 20 years.