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

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    Marsh harrier age

    The upper parts of this male Marsh harrier struck me as being very unusual, at least to what i am used to see. Still many brown feathers, yellow lesser coverts, yellow head, subterminal tail band. Yet the underparts look adult. After some reading i think this could be a 3 CY bird. Is this...
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    great black backed gull or yellow legged gull, Netherlands March 29

    Sorry for the poor photos but is there anybody who dares to say anything about this gull. Was thinking on a 2 CY yellow legged gull or possibly a great black backed gull. Best regards, geert Custers
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    nocturnal flight call, the Netherlands

    on June 11 I recorded these 2 sounds during the night. Calls are recorded 1 1/2h after each other so it is not necesarily the same bird. A very experienced birder mentioned he had once before such call and following discussions with other nocturnal bird recorders they concluded his bird was most...
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    nocturnal flight call, the Netherlands

    2 weeks ago i recorded this sound during the night. Unfortunately there was only 1 call. I got a suggestion that this might be a little bittern but am not certain about this. Anybody knows which bird this was? Best regards, Geert
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    ashy or grey-tit flycatcher, Zambia Lake Kariba

    Would appreciate to know if this is an Ashy or a Grey tit flycatcher. Bird was seen in December in Siavonga, Zambia. Best regards, Geert Custers
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    Cisticola North Zimbabwe - Lake Kariba

    I thought this was a red faced cisticola but the dark forehead / crown is putting me off. Anybody knows which bird this is? Seen in December near Kariba, North Zimbabwe. Best Regards, Geert Custers
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    bourgas eagle

    Among many lesser spotted eagles this one seemed to be different. Unfotunately no photo is showing the underwing barring. Anybody dares to say which eagle this is? photo is from September 20. Best regards, Geert
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    Swift Lake Kariba Zimbabwe December

    I think this is an African Black Swift but the big pale throath patch gives me some doubt. If ID is correct, is the colour and size of the throath patch normal for an African Black Swift? Best regards, Geert
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    Firefinch Kariba Zimbabwe

    I am struggling with this bird. Bill is mostly grey but does have some red as well. Is this a Jamesons's Firefinch or an immature Red-billed Firefinch? Best regards, Geert
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    chat / cisticola Kariba Zimbabwe

    Sorry for the poor quality but this bird was very distant. I was thinking on a winchat but doesn't seem to fit quite right. Anybody any idea what it could be or is there just not enough detail to ID it. Regards, Geert
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    Southern Red Bisshop Zimbabwe

    Have seen several of these birds in Kariba, Zimbabwe on December 12. Are these all Southern Red Bisshop? Best regards, Geert
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    Martin in Zambia

    Saw this Martin on December 9 near Siavonga, Lake Kariba. Is this a Banded Martin? it doesn't have a breast band but don't know which other martin has a band across its vent. Regards, Geert
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    field guide nicaragua / costa rica

    When visiting both nicaragua and costa rica would i be needing both the Guide to the Birds of Nicaragua and Garrigues, Birds of Costa Rica? I do have the costa rica field guide already. Or would Birds of Mexico and Central America from van Perlo be a better option in order to limit weight? Best...
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    birdsound Portugal

    I have only heard this bird and don't know what it is. Heard it near Fuseta, Algarve 2 weeks ago. Sound can be heard on the short (=kort) recording at seconds 3, 8 and 17. I have also included the longer (=volledig) recording in case that would give some further info. Any body any idea what...
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    Weaver tanzania

    I saw this weaver in July in the coffee plantations in Kilimanjaro NP. Is this a juvenile Baglafecht weaver? Best regards, Geert
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    bourgas bulgaria white winged tern September

    Are these both juvenile white winged terns or is the left one an other tern species (whiskered?)? Left tern seemed to have a more scaly pattern on the mantle and less pronounced head markings. Best regards, Geert
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    merganser august Iceland

    which merganser is this? female common merganser male red-breasted merganser in transition plumage? or.. Sharp edge of the brown headplumage made me believe its a common merganser. Striping on breast fits however better on a red breasted male. Best regards, Geert
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    gull iceland

    Which juvenile gull is this? Sorry for the poor quality Iceland August. Best regards, Geert
  19. G

    Eagle, September Bourgas Bulgaria

    This eagle stood out between the lesser spotted eagles as it seemed to be bigger but unfortunately it was flying very high. photos are therefore not revealing much details. is this yet another lesser spotted or is this an other eagle species? Best regards, Geert
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    kelp gull Portugal

    When I was watching the kelp gull in Olhao Portugal 2 weeks ago I realised I had seen a dark backed gull on exactly the same location several years earlier. Back home I checked my records and it was August 20 2009. The leg colour of that bird didn't seem to fit very well for a large black...
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    Yellow legged gull, the netherlands

    Earlier this month I saw this gull. At first I thought this to be an adult yellow legged gull but in flight it showed a lot of white on P10/P9. White mirror on P10 is completely merged with the primary tip without any black in between them. Is this occurring more frequently or is this possibly a...
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    Juvenile Hawk Puntarenas, Costa Rica

    I have seen this hawk in July and put it away as a Grey Hawk Now after reviewing the photos again I feel this is a Common Black-Hawk because of the barred undertail coverts, streaked crown and short tail. Would appreciate to hear your comments and any other ID features to better separate them...
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    Oriole Costa Rica

    This Oriole was seen near Heredia in December in Costa Rica. We are having a discussion if this is a Baltimore Oriole or a Orchard Oriole. Unfortunately no photo of the breast is available. Hope that anybody can help us out identifying this bird and indicate which key feature is visible in this...
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    flycatcher st Lucia South africa

    Seen this flycatcher in August but down know which species it is. Could it be ashy? Best regards, Geert Custers
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    unknown from Swaziland Milwane Wildlife Sanctuary

    Found 2 more dodgy photos with birds I can't identify. First one is a martin i think (brown-throated?) that flew by while taking a photo of a reed cormarant and water thick-knee. There where several martins flying / feeding just above the lake. The forked tail on the second one is probably a...
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