The most common cause of an obstruction in the biliary tree is a bile duct stone (choledocholithiasis). This includes a stone or stones lodged in the common hepatic, cystic or common bile ducts. The causes, symptoms and treatment is discussed further under Bile Duct Stones.
The U.S. Federal government has listed the leatherback as endangered worldwide. Within the U.S., the leatherback is known to nest in Southeastern Florida, Culebra, Puerto Rico, and St. Croix.The leatherback is the largest living turtle and is so distinctive that it is placed in its own separate family, Dermochelys. All other sea turtles have bony hard plates on their shells (carapace).ithin the U.S., the leatherback is known to nest in Southeastern Florida, Culebra, Puerto Rico, and St. Croix. The leatherback is the largest living turtle and is so distinctive that it is placed in its own separate family, Dermochelys. All other sea turtles have bony hard plates on their shells (carapace).
Tortoiseshell material backlit. Tortoiseshell or tortoise shell is a material produced from the shells of the larger species of tortoise and turtle, mainly the hawksbill turtle, which is an endangered species largely because of its exploitation for the material.n 1973, the trade of tortoiseshell worldwide was banned under CITES (the Convention on International Trade in Endangered Species). The material was already often imitated in stained horn, plastic and other materials, and this continues.