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

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  1. J

    Do any birds migrate along an arc?

    Just reading Vagrancy in Birds, which I think answers my question. In the book it suggests that there is no real evidence that birds migrant along an arc as this requires 'map sense', i.e a knowledge of where you are and where you want to go (and I suppose an understanding that the world is...
  2. J

    Do any birds migrate along an arc?

    Interesting point about the endogenous clocks. I presume that this relates to species that need to avoid certain obstacles, such as the Greenland race of Wheatear, that crosses the Atlantic by the shortest sea crossing, prior to travelling south to Africa. Perhaps this also applies to Common...
  3. J

    Do any birds migrate along an arc?

    Fly from London to New York and the plane flys an arc - the shortest route loops north over the Atlantic, and is not a constant bearing. Is anyone aware whether gps tracked birds have proven that they have the ability to fly an arc route during migration - the shortest route between breading...