What are the significant themes of the lastling by Philip gross?

friendship betweenparis and tahr made them to know each other, though they didnt have anything in common . appearances of many characters in the novel are different in the end .examples: franklin used to have a cool and composed personality but in the end he turned out to be evil. paris was tomboyish and strong and brave but in the end she became scared from the inside and was like ordinary and random girls. as the wheel f life turned ,as everything came around , the novel discussed all the species that are that are extinct and the way they are being hunted the last of them.