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Description
The area around Upper Mangatawhiri Reservoir offers excellent habitat diversity for forest and wetland birds. Pūkeko (Australasian Swamphen) and Masked Lapwing can be found around the campground, while Black Swan, Paradise Shelduck, Canada Goose and various ducks occupy the lake. Kererū (New Zealand Pigeon) pass overhead, New Zealand Fantail and Grey Warbler are everywhere, and forest birds are abundant throughout the area. This is the closest mainland site to Auckland where you can reliably encounter New Zealand Bellbird and have a small chance of finding North Island Kokako.
While you can visit just the campground and dam area, the best way to explore is by walking Ernies Loop Track, which circles the reservoir. The middle section follows a narrow trail that is often quite muddy, includes a river crossing, and climbs up the range on the eastern side. But it's great fun! North Island Kokako are mostly heard and sometimes seen around Piggotts Campsite, while the northeastern section of the circuit is the best area for New Zealand Bellbird. Along the track, you're also likely to encounter the introduced but charming California Quail. Other common forest birds include Tui, Tomtit, and Silvereye. Also very occasionally New Zealand Falcon are seen in the area.
Details
Access
The reservoir is accessible only by private vehicle, approximately 1 hour's drive from Auckland. The last stretch through the Hunua Ranges is on gravel road.
Ernies Loop Track is about 15 kilometres and takes at least 6 hours with active birding. The first and last thirds follow gravel road, while the middle section is on a narrow trail. If going clockwise, don't miss the turn-off to the right onto the trail. While there are boardwalks, expect muddy sections after rain. There is also a stream crossing on the northern side of the track before it climbs up into the ranges.
Toilets are available at both Upper Mangatawhiri Campsite and Piggots Campsite.