This mountain is also the home of the small yellow-crowned parakeet (Cyanoramphus novaezelandiae).

Parrots like the Kaka and Kea can often be seen and heard and are quite large in comparison to the Yellow-crowned parakeet.

For many years the Malherbe's Parakeet was considered a subspecies or as colour variant of the commoner Yellow-crowned Parakeet.

The Yellow-crowned Parakeet, Cyanoramphus auriceps, is a species of parakeet endemic to the islands of New Zealand.

Mitochondrial DNA analysis has indicated that the Orange-fronted Parakeet is a separate species and not just a colour variation of the Yellow-crowned Parakeet.

In New Zealand, the stoat feeds principally on birds, including the rare kiwi, kaka, mohua, yellow-crowned parakeet, and New Zealand dotterel.

Native New Zealand birds that can be found on Pigeon Island are: Tui, Wood Pigeon, Bellbird, Brown Creeper and Yellow-crowned Parakeet.

Landbirds include Red-fronted and Yellow-crowned Parakeet, New Zealand Falcon, Tuis, Bellbirds, Pipits and an endemic subspecies of Tomtit.

Furthermore, Chatham Island's Yellow-crowned Parakeet and the red-crowned populations of New Caledonia, Norfolk Island and the subantarctic islands have been determined to be distinct species (Boon et al., 2001).

Notable species on the island include the Cook Strait Giant Weta, Shore Plover, North Island Robin, Takahe, Wellington Green Gecko, Yellow-crowned Parakeet, and Brown Teal.

The three species on mainland New Zealand are the Yellow-crowned Parakeet, Cyanoramphus auriceps, the Red-crowned Parakeet or Red-fronted Parakeet, C. novaezelandiae, and the critically endangered Malherbe's Parakeet (or Orange-fronted Parakeet), C. malherbi.