Turtle, A Symbol of Good Luck and money. A tortoise shell is among the most peculiar but successful pieces of design in the natural world. Their shell are made up of the fibrous protein keratin. The color of a shell may vary. They are commonly colored brown, black, or olive green. In some species, shells may have red, orange, yellow, or grey markings. Most species of tortoise live on land, but some live in fresh water.

圖片編號： 130381060
拍攝者： Luhru6