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women's t-shirts crow feces women's t-shirts droppings women's t-shirts fecal matter women's t-shirts microorganisms women's t-shirts contamination women's t-shirts unsanitary conditions women's t-shirts bacteria women's t-shirts sem women's t-shirts bird poop women's t-shirts microscopy women's t-shirts colorization women's t-shirts colorized women's t-shirts enhanced women's t-shirts scanning electron microscope women's t-shirts

photographs crow feces photos droppings photos fecal matter photos microorganisms photos contamination photos unsanitary conditions photos bacteria photos sem photos bird poop photos microscopy photos colorization photos colorized photos enhanced photos scanning electron microscope photos

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Colorized scanning electron micrograph (SEM) of crow droppings. Crow feces represent unsanitary conditions in urban areas in North America as crows defecate onto sidewalks, walkways, cars etc. from trees which they choose to roost overnight all together. This micrograph was obtained by collecting a fresh dropping, dispersing it in a liquid fixative, allowing heavy particles to sediment, and capturing the bacteria-containing supernatant on a bacteriological filter for SEM. Image width 9.14 micrometers. Magnification 10,940x if the image is printed 10 cm wide.