Otanewainuku is covered in virgin unlogged forest and is home to a variety of native birds and animals. Large emergent rimu trees are common. Tawa, kamahi and rewarewa form a high canopy and bird species such as robin and bell bird are readily seen and heard.
Since 2002 a volunteer trust has been helping to conserve the precious wildlife of Otanewainuku. Kiwi, whiteheads and forest gecko are all found here. Recent releases of kiwi and kokako have proved successful.
Otanewainuku is suitable for short walks or a day trip and provides an excellent example of original forest with giant trees and healthy bird life.