Camouflage

Camouflage Joe Haldeman paperback copyright 2004 289 pages ISBN 9780441012527 Two aliens have wandered Earth for centuries. The Changeling has survived by adapting the forms of many different organisms. The Chameleon destroys anything or anyone that threatens it. Now, a sunken relic that holds the key to their origins calls to them to take them home--but the Chameleon has decided there's only room for one.