Possibly the kiwi didn't get the memo that it was the listening period because they were pretty quiet this year! Other areas reported similar behaviour.
Would you like to do kiwi listening on your property?
We had three lots of folk listening on the peninsula (the red squares above). Listening is two hours per night for four nights, you record the direction (using the digital compass on our cell phones), an estimated distance and whether the call was male or female. This is what a completed recording sheet looks like.
Deb, Fleur and Adrian at the Rangitane National site recorded 10.1 calls per hour vs 18.3 last year, a big reduction. The last night, completed toward the end of the second listening period averaged 16 which saved our bacon a bit, bringing the four night average up into double figures.
Ross Lockyer bucked the trend at the start of Doves Bay Rd getting 12.75 calls per hour vs 10.3 last year.
Kathrine and Al Pankhurst averaged 4.75 calls per hour at Aroha Island.
We have three electronic listening devices and we rotated them around 17 different locations during the listening period (the yellow squares on the map above).
These devices don't have the range of the human ear, but do pick up the closer calls. We programme to record from 6:00pm - midnight and leave them out for five nights.
We then run the audio files through this free software from www.avainz.net and it identifies potential kiwi calls. Pretty cool kit.
Below is what the calls look like on the screen, male and female produce distinctly different graphic patterns. Highest recorded average was at Margaret Cooper's property on Kurapari Rd 3.7 calls per hour.
Here's a couple of audio files
A rowdy male: