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

In flight IR images from trail camera, Western Switzerland (1 Viewer)

S_Man

Well-known member
Time and white wing spot suggest Nightjar, but they are not common here.
Might also be another bird species that was disturbed (around 1 AM at night) or even a bat ?
 

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Excellent. Bat presumably, and looks not unlike one. As it's IR, I don't see why a (bird's) white wing-patch should show up at all - and I don't see one: there's a thin white trail which could come from some hotter bit on a bat's wing.
 
.....or a Hawkmoth?
Nope, moths are too small to be on focus, and by far (I have multiple example with this same trail cam)
This is either a bird or a very large bat. The problem is that the only large species of bats in this area doesn't fly like that, they have deep wing beats, with wings nearly touching at bottom.
 
About spots on the plumage, you can see them on IR pictures, at least to some extent. I have night photos and videos of a Tawny Owl with 2 different trail cams, and striated or barred details appear "clearly" on both cams... IR is a weird mix of temps and contrasts.
 
It is a bat. It has no beak and no long tail.

White wing patch is puzzling. A ring? Dirt? But it is not located where the wing patch of a nightjar is.
 
Another one for bat. Jurek’s suggestion of a ring is an interesting possibility. The white patch/streak seems to be in the right area for a bat ring.
 
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