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

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  1. W

    Ivory-Billed Woodpecker continued

    And we have the problem that we still do not know what a source area looks like; there are arguments that, based in part on habitat preferences of Imperial and Cuban IB, pine forests were the preferred habitat and swamp forests are suboptimal habitats which allowed persistence rather than expansion.
  2. W

    Ivory-Billed Woodpecker continued

    What do you think Ivorybill specific management would look like?
  3. W

    Ivory-Billed Woodpecker continued

    How so?
  4. W

    Ivory-Billed Woodpecker continued

    Sounds like some evidence, even if not proof. Can you expand at all? I can certainly understand why you might not be willing to name the site, but any details would help those of us with an interest and an open mind to make a personal judgement. At the very least, what time of year was this...
  5. W

    Ivory-Billed Woodpecker continued

    Apologies to ZanderII for misuse of “feel”; I was simply trying to phrase my statement in a non-judgemental way. 😉 Of course a Scientific approach deals only with hypotheses and evidence; if you want to take this to the extreme, at this precise moment, looking out of my window, I cannot prove...
  6. W

    Ivory-Billed Woodpecker continued

    Sadly, I cannot see much point in this thread continuing, as I don’t see anything that would bring either “side” to change it’s position. One side “knows”, possibly from personal experience, that the Ivorybill’s extinction is much later than generally accepted, and indeed it may still be extant...
  7. W

    Ivory-Billed Woodpecker continued

    I suppose it comes down to why it matters. If there are still Ivory bills, then they have managed to survive as a population without human help. If they are proven to exist, would this lead to changes that could aid their recovery? In this case, I would argue that proof matters and no avenue to...
  8. W

    Ivory-Billed Woodpecker continued

    As a birder, I know that there are various levels of personal sighting, from the might have been glimpse (not on the list) through the sighting that you, the observer are certain of, but cannot prove to the satisfaction of a record committee, to accepted records. Bottomlands, how many sightings...
  9. W

    Ivory-Billed Woodpecker continued

    Correct; statistically the null hypothesis must be that there are no longer any living Ivory bills; the null hypothesis is statistically disprovable, whereas the hypothesis that they are extant but impossible to find is not disprovable.
  10. W

    Ivory-Billed Woodpecker continued

    The first question has to be how much variation there is in Pileated flap rates. From my quick web browsing, the data seems to be limited; a small number of flights which could conceivably emanate from one or two individuals. Would there be variation dependant on moult? Or weather conditions...
  11. W

    Ivory-Billed Woodpecker continued

    And me!
  12. W

    Ivory-Billed Woodpecker continued

    Well, if you do go, go with my thanks for the links to the Louisiana vertical view video; it is the most interesting evidence that I have seen. It is not conclusive by any means, but I am struggling to come up with an identity that I am convinced by.
  13. W

    Ivory-Billed Woodpecker continued

    Also, please look at the list of species in your table from Pennycuick; a set of seabirds and a swan is not a reliable indication of Woodpecker aerodynamics! Proof that the Gaussian distribution applies is needed here.
  14. W

    Ivory-Billed Woodpecker continued

    So I have continued to look at the evidence presented; some of the data is indeed interesting, although none of it looks conclusive to me. When I was an active researcher in Bristol in the late 1970’s I was just along the corridor from Colin Pennycuick’s research group, which also contained...
  15. W

    Ivory-Billed Woodpecker continued

    I suppose I would come in your “World Birder” category having a list in the thousands and having visited all four of the locations you mentioned. Why have I not sought out Ivory-bills? Too little time; there are still thousands of easier species to go after! Secondly, I am based in the UK; if I...
  16. W

    Ivory-Billed Woodpecker continued

    Ok, I really object to being accused of trolling; all I am trying to do is get to the bottom of your argument. I am a trained and published Biologist (in Malacology, rather than Ornithology) and a recently retired educator who has spent much time and effort trying to get people to express their...
  17. W

    Ivory-Billed Woodpecker continued

    Are you saying that there is unambiguous accepted film of Ivory-bills from the Singer Tract population that allow a measurement ( not an estimate) of wing beat frequency? If so, what is the published reference to this measurement?
  18. W

    Ivory-Billed Woodpecker continued

    Where is the MEASURED frequency of Ivory-billed wingbeats? A different measurement from Pileated could indicate that this is an incorrect identification, but does not prove that it therefore must be Ivory-billed. Also, could you clearly state what you are claiming? Continuing survival of a...
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