Actually, Galapagos is more of a where rather than a what. A group of islands off the South American country of Ecuador's Pacific Ocean coast. The word is Spanish meaning saddle. or more accurately, saddle back (named after a resident type of tortise). Charles Darwin made them famous.
Mastodon is is or was a type of elephant that became extinct (st least in North America around 12,000 years ago. Related to the mammoth and modern elephant, but different is conformation, size and habit...