DEE BREGER / SCIENCE PHOTO LIBRARY DEE BREGER / SCIENCE PHOTO LIBRARY
Iguana tail spines. Coloured scanning electron micrograph (SEM) of skin from the tail of a green iguana (Iguana iguana) showing scales and spines. Iguanas are a type of lizard. The green iguana is native to tropical South America, but make popular pets. They shed their skin periodically as they grow and new scales grow underneath the old ones. Some scales develop into horns or spines for protection. Reptile scales are made of keratin. Magnification: x70 when printed 10cm wide.
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