A new device for recording bird calls. Kiwi and Ruru calls.

General birdwatching discussion, help with bird identification, and all other things relating to wild birds and birding in NZ that don't fit in one of the other forums.
Weka1
Posts: 36
Joined: Wed Sep 10, 2014 8:15 am

A new device for recording bird calls. Kiwi and Ruru calls.

Postby Weka1 » Wed Jul 03, 2019 7:51 am

Monitoring nocturnal calls can be cold and sometimes a bit miserable.
I've borrowed a newly developed AR4 recorder and set it up in Russell State Forest, Northland.
This is primary forest. Some years ago I had previously spent the required 8 hours listening protocol for kiwi calls - and recorded one female.
So I was not expecting much.

The recorder was brilliant!
Sound quality was good.
The Kiwi were easy to hear and see on the spectrogram. There is no directional indication but I was probably recording calls from two pairs.
Ruru gave a good number of calls as well (See attachments).
So the recorder picked up Kiwi presence where I had not.
And I did not recognise any possum calls. That is good news.

20190613_203004 a.wav [ 1.08 MiB | Viewed 315 times ]

All Ruru calls.wav [ 1.42 MiB | Viewed 315 times ]


The significance is that a 1080 drop happened late last year in Russell Forest.
Kiwi can now, if the control is maintained, hopefully increase substantially from their present numbers.

I read a memoir where in 1841 a party got bushed and had to sleep over in Russell Forest and were 'kept awake by the Kiwi and owls calling all night' .
It would be great if we could get back to sleepless nights in the forest again!

Spectrogram of 15 minute range from 2030-2045 of kiwi calls showing distinctive Kiwi call pattern. Ruru 'Oww' calls are a series of vertical lines just after the very loud female Kiwi has called. There is a second male kiwi call just before 10.00 (minutes i.e. 2040) on the spectrogram.

Screenshot of A40 record 13 6 2019 2030-2045.JPG
Screenshot of A40 record 13 6 2019 2030-2045.JPG (135.39 KiB) Viewed 315 times
scaber
Posts: 19
Joined: Mon Feb 12, 2018 8:09 pm

Re: A new device for recording bird calls. Kiwi and Ruru calls.

Postby scaber » Sat Jul 06, 2019 12:46 pm

I'm impressed with the sound quality here, very clear - at least to my untrained ear!!
Greg Mckenzie

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