I find it slightly bizarre how MJ was touted as being 'very naturalistic' at the time [as well as the fact the zoo erected a full-scale website for the purpose of promoting MJ], though this just about shows how 'natural' the indoor houses were The climbing opportunities are good, though nothing avant-garde. If anything, the indoor houses of MJ resemble more a deforested logging area's rehabilitation centre..
The outside areas are nice, though I wouldn't necessarily call it 'jungle'.. more so nicely-planted exhibit in a wildlife park