Explanation:
it is unique in being the only human bone that is not attached by joints to any other bone, but is suspended in the neck by muscles and ligaments alone.
Just about every rocky shoreline in the Galapagos Islands is home to the marine iguana.
These lizards are found throughout the islands, and have population concentrations of up to 4,500 individuals per mile. Their total population on these islands have been estimated to be between 200,000 and 300,000.