ML 165993

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Rallus sp. -- Rallus sp. More
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Richard L Todd
Jun 1969

    Geography
  • United States
    Locality
  • Arizona/Colorado along the Colorado River.
No locations found with lat/long
    Channels
  • Mono
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    Equipment Note

LNS: 250 Hz AUHipass filter applied in soundBlade to the fourth, fifth, and sixteenth segments only.

This bird was responding to playback of Rallus longirostris.

These cuts are part of a compilation made in 1969. They include rails responding to playback along the Colorado River in both Colorado and Arizona.

Recordist's Note: "In 1969 we began covering the Colorado River more extensively for a population inventory, often separating in some localities, to cover more areas. We had detected, conservatively, some 200 individuals when, one May morning, this writer chanced into a marsh where the birds were unusually willing to sound off. I decided to record some of these sounds, but was rather disappointed that the most cooperative bird was giving such a nontypical call. When I played this call for Mr. Tomlinson that evening, he informed me of what rail I had possibly recorded. We spent the next couple of days in the area. We found birds that would give this 'kek-burr' or 'kek-hurrah' call and other birds that would not give this call, but lost no time in responding with the calls we were previously familiar with.

We retraced our routed on the river to previously-located rail populations, and tried this 'kek-burr' call on them. We elicited many excited responses, but nowhere else a 'kek-burr'-type answer.

These birds giving the 'kek-burr' call were not scattered individuals, but occurred in at least two or three colonies, and total numbers easily exceeded seventy birds. The first 'kek-burr' birds observed seemed, to this writer, to be slightly larger and had a more massive bill than the 'other' rails, but subsequent observations on other birds of this colony considerably confused the issue. Our photography--with telephoto lens--fair to good, if less than outstanding--fails to show any easily recognizable morphological differences."

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