ML 161675


Interview :04 - 38:47 Play :04 - More
Audio »
Video »
species »
Russ Charif  







Ivory-billed Woodpecker search; Autonomous Recording Units; Bioacoustics Research Program  

NPR/NGS Radio Expeditions
16 Aug 2005

  • United States
    New York
    Tompkins County
  • Cornell Lab of Ornithology
  • 42.4800624   -76.4514796
  • Stereo
    Sampling Rate
  • 48kHz
    Bit Depth
  • 16-bit
    Equipment Note
  • Stereo=1; Neumann KMR-81

DAT #2 IBW Cornell
Radio Expeditions
Chris Joyce, Bill McQuay

CJ-chris joyce
CC-cornell guy

(Sweeping sound Chris and Cornell guy chatting about when things will air)

2:04 CC-So one thing I just want to, I and think you have got this. There was such a fuss with Rick Prome a few weeks ago, about you know, conclusive evidence. And being completely convinced. Because the sounds just prove everything. The release came out of the Yale ...he got religion on this and urn (changing right to left to stereo again)

CC He wants us to come out and say here's the proof but that's not what we are going to do. Our quantitative test show suggest that its not just our ears and its not just a little bit of wishful thinking but based on measurements made by a computer untouched by the hands of optimistic biologists, those measurements made on unknown sound and known ivory billed and blue jays and white-chested, these known sounds are more similar to IBW than either of the two species. The caveat to this is, and the reason we're not 5:53 CC I think we started with part of the original 1935 recording, I don't know, exactly how long a piece of it I played. I think it was something like this.

(Left ear)
6:00 CC Okay this is a portion of the recording made by Arthur Allen and the singer tracked in Louisiana in 1935 this is, two a pair of ivory billed at a nest and this is the only recording in existence and this is the only recording where the identity of the birds is known for 100% certainty.

6:32 CC Whoops sorry, wrong speed

[6:40 to 7: 17]

CC Next. ..
7:25 (cj-rustling)

7:43 (rustles sounds) CC Okay so the next thing we did was a segment of that same recording, played in the swamp in Arkansas, in January 2005 and re-recorded on an A-R-E at a distance of about opening the champagne is that we, you know we remain concern about the prospect about these tricky blue jays out there. And we'll feel a lot better about that after a few months more of recording which we will have the chance to do in November. So I just want to make sure that our somewhat more conservative, excited and optimistic yes, but somewhat more conservative take on this comes through

Chris We rolling? Good. Have you settled on the kind of tight language to use on last line of paper, conclusions?

CC People are working on that right now.

CJ=-well I would like to call you next week and say, what's the language

CC I can email you

Cj-yeah, email me so I can use exact as much of the exact words. We never quote exactly but I will use the definitive words that you need me to cast. Use a yellow marker. For confidence level, 95% 98%

CC We're not going there yet (laughter)
So let's see if we can recreate our footsteps.
145 meters, and there is throughout this recording a high pitched wine. Which is an artifact of the recording device and has nothing to do with the bird or the forest. CC Okay.

CC I'm gonna save that exact segment as a wave file ...

Cj-we're here tomorrow to about 230.

(Typing sound) 145 meters, 16 bit wave ....1935...
Cj-that was 145 minutes away?

CC Yes

CC Then we went okay, into 29th of January, okay, hmm, so this is one of our suspicious sounds. Recorded on an ARU on the white river, possible IBW, this is the date is jan 29th 2005, 8:50 am

[10:37-10:52} CC As background to that last clip. This sizzling sound is rain falling in the swamp and Carolina wren are the two loud bird sounds ...
(he's mumbling to himself to find file)

12:00 CC after that we did, then we replayed those two back to back, so you can do that.. okay. And then we have Ben Clock's blue jay.

Bill-what about the quarter speed.

CC Yes we'll go back to those, good thank you.

CC This is a recording made, I don't know the date, made in the white river, in feb or march

12:52 (Boy-whispers 19th of march)

CC Ah good! The 19th of march, 2005, in the white river, close to the area where we heard the, recorded in the ARD. This is a group of blue jays, there is a mix of typical blue jay sounds that are somewhat similar to Ivory-Billed kent calls.

[13: 16-13:31]
CC Now we do the quarter speed comparison ofthat

(computer sounds)

14:20 CC Yeah, do the back to back 'l4 speed?

14:47 CC Quarter speed .. .it will take me just a moment to get this set up ...

15:20 CC And something like this, let's try this (whispered)

CC So first we're gonna hear three individual calls, slowed down to 'l4 speed. First we'll do a field recording played back through the swamp. First at full speed. 3 indiv notes. The 1935 recoding played back this past Jan, then our unknown single note recording, and then we'll do one of these bluejay notes an then we'll do the three again 'l4 speed [16:17, again 16:19]


[16:22, again 16:23]

CC And now this unusual bluejay call [6:29, 16:30]

CC Let me try a different one, that doesn't sound anything like an ivory bill.

16:45 sounds like a bluejay

CC Known IBW Forrest at Yt speed. I'll play it twice.

[16:59-1705] CC Want me to amplify?

[17: 16 again] CC You know that doesn't sound as good as the one we had before.


CC I'll play it again 18:03-CC More lead in


CC Okay and here is our ARU mystery sound.

[18:24 18:28]

CC Known bluejay 'l4 speed [18:36-18:38]

18:46 CC That is it for the Kent calls.

(computer searching)

20:00 CC So we begin with Campephilus pollens

20:10 CC This is the powerful woodpecker
Two double knocks from the powerful woodpecker that Campephilus pollens recorded somewhere in s. America, not sure where, from the Macaulay Library.


CC And then we had a series of double knocks from Campephilus rubricollis which is ...(Boy-whispered Red Neck) red-necked?

[20:53-21 :02]

Cj-the CC Pale billed woodpecker which many American birders have seen in central amer and Costa Rica.

CC Pale-billed Campephilus guatemalensis [21 :33-21 :38] CC And it's worth noting in all these double knock recordings when you hear three in a row you are hearing them unnaturally close together. Because those have been clipped out. An there is one more thing that I wanted to play you while fitz is here.

22:10 CC The cash river Christmas Day ....

22:30 CC This is 4:30 on Christmas day 2004

21:36 CC Double knock followed by a gunshot

Cj-that double knock was isolated or were there several?

22:52 CC Isolated, most of the ones we have are isolated. But I'm gonna give you a couple of

23:00 Cj-there were two, one followed each other

CC Yes that's this next one.

23:16 CC This is the recording which provides, potential evidence, our interp is that this recording suggests the exchange of signals between two birds the first one far away and the second one, closer to the recorder. The first is about 5 sec into the recording, maybe difficult to hear and answered 3.5 sec later. And there is also, a series of alarm calls through the recoding

CC Jan 24,6:45 am and this is very close, one kilometer from where those kent calls were recorded and its during the same period of time. That those kent calls were J, recorded. [24:13-24:24]

Cj-that is how can you tell there is distance between the two?

CC We are inferring distance from loudness ....(stutters) Looking at the spectrogram, though its subtle, that there's a little bit longer reverb from first than second. I wouldn't swear to it with out measurements but It would suggest, the length of the reverb would be , well, its hard to say, it might say something about distance, its be going out on a limb. (bumbling a bit)

26:27 CC Here is something that we just located .... CC 26:38 this is a recording from McCauly library. I don't even know what species this is? Its some tropical kempafalous. We'll look it up ,but it sounds like two birds exchanging double knocks but its one. So in some ways its similar to what we just heard.

[27:02 that's one (he says over recording which continues--27:46]

CC So this piece in particular

[27:50 -27:56] CC sounds like two different pieces of wood being hit.

28:00 CC the first is a little farther away, the dif in amplitude isn't as great. But somewhat similar. But timing is about three sec. Between those two. And our case was about 3.5. in some it seems like a very fast response like this.

[28:31] CC That sounds like the same two pieces of-

28:38 CC Here lets just do this here ...


[28:05-28:07] CC that first one has a less resonate sound and in fact you can see less reverb to it. So my suspicion is that there are two birds, not at too terribly different distances from the microphone, one's a little bit close than the other. But on dif pieces ofwood so dif sounds to them. Exchange somewhat similar to our recording but ours has different distances.

CC Arkansas pepperwood CC Some is not suitable for public airplay, fcc. Some is pretty offensive ...

30:30 CC Them coming upon the ARU right (some other young guy says this, the whisperer helper from before)

CC Do we need a release? Cj-I don't know that we'll use it.

CC Just for posterity.

[30:45 (water sounds) 33:02 some kind ofbird, a hoo doo bird ... motor at the end35:46]

January 18th

CJ-Just before we were there, people suspected that.

BOY-my favorite part was when they said, It must be a really boring job who ever has to sit there an listen to all this.

CJ -snell dart

CC Yes their recognition of the possible consequences of this Cj-they mentioned something of the endangered species.

CC They caught on to the fact that the ARU ...of course. The ones we are using there are a little different than Louisiana. When they were talking about the Deer Hair. The windscreen has synthetic brown fur,

CC When we looked into prices, we could make something for couple bucks and say a few hundred dollars

BILL-need to record sound of the room

(they all clear out)

Cj-you think you can make a cd with that on there? We don't know the names of these guys.

39:00 door shuts, water cooler settles.


[39:20 ROOM WHERE ANALYSIS DONE (run under whole piece Bill suggests)

43:03 OUT]

Close Title