"We're encouraging New Zealanders to take part by counting the kereru in backyards, schools, parks or reserves.
The information collected from this nationwide project will be used by conservationists to better protect kereru and to help save our native forests."
The humble kereru is one of New Zealand's most valuable assets when it comes to our native forests. Kereru are known as the "gardeners of the skies" as they play a crucial role in dispersing seeds of native trees such as tawa, taraire and matai.
No other bird can fulfil this function, making the species essential for forest regeneration.
Ms Esterhazy said kereru were distinctive birds.
"Their large size and bright white singlets, surrounded by green and purple plumage, makes them easy to spot perched in treetops or on power lines," she said.
"To make kereru counts, people can use a computer, laptop, tablet or smartphone - whatever works best for the observer."
This year, there are three options to make kereru observations - via www.greatkererucount.nz, www.naturewatch.org.nz or with the iNaturalist App available on iTunes and Google Play.
An online map showing all sightings and a ticker with the number of birds reported will be updated automatically as the count progresses.
* Join the count at www.greatkererucount.nz