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Wood pigeon feather under the rain. Pigeon feathers are hydrophobic. The water drop, supported by network formed by barbs and barbules, sits partially on air pockets. A twofold structure of a feather flavours large contact angles and provides its water repellency. Besides, water drops act as magnifying lenses changing the pattern of the feather barbs.
Holm oak forest
Camera Model: NIKON D300. Exposure Time: 1/60 sec.; f/32; ISO Speed Rating: 800. Exposure Bias: 0 EV; Focal Length: 90.0 mm. Flash fired