STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Penguin down feathers, coloured scanning electron micrograph (SEM). The penguin (family Spheniscidae) has the most densely packed feathers of any bird. Penguins have a layer of down growing beneath the main contour feathers, as well as a thick layer of fat under their skin that traps air and helps to insulate their bodies from the cold. Magnification: x50 when printed 10 centimetres wide.
Model release not required. Property release not required.