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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. R

    Question about Bird Song Frequencies

    They honk in chords!
  2. R

    Question about Bird Song Frequencies

    Thanks for suggesting "RSPB Guide to Birdsong"! I've ordered a copy and look forward to ready it.
  3. R

    Question about Bird Song Frequencies

    While searching for a list of bird song frequencies, I came across this statement: “The Canada Goose has a fairly large vocal range, of 500-850 hz, and there is little discernible difference between the subspecies (Whitford 1998).”...
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