Polarised light micrograph of cross section of porcupine (Erethizon dorsatum) quill. These quills,like hair and horns,are made of keratin. The quills are not hollow,but have a honeycomb structure. Porcupines produce a pungent warning odour when their quills are erected. Quills also contain a fluorescent material that brightens the quills at night,when the porcupine is most likely to meet predators. Magnification: x16 at 10cm wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Lowry, Steve |
Bildgröße: | 4180 px × 4180 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |