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).
According to the IUCN, green turtles are listed as endangered, and their numbers are decreasing. Green turtles are hunted and their eggs are collected by humans, a legal practice in some countries. Green turtles are also threatened by destruction of nesting areas and foraging areas in the sea.