21. Some sea pens exhibit glide reflection symmetry, which is rare among non-extinct animals ( see ). 22. But I do think people have an interest in large, ancient, extinct animals like the mammoth, 23. Dating was possible as the two reindeer were carved in the ivory of an extinct animal . 24. I'm also interested in any ethical " arguments " against " re-animating " an extinct animal . 25. One of the unique features is the statue park where lifelike statues of extinct animals are exhibited. 26. Svetz's section uses time travel in an attempt to bring back long extinct animals from Earth's past. 27. These trackways include tracks from numerous extinct animals such as " Dimetrodon " and " Edaphosaurus ". 28. The Hyolitha are a class of extinct animals with a shell and operculum that may be molluscs. 29. Some extinct animals such as sauropod dinosaurs appear to have used stones to grind tough plant matter. 30. Ferguson has worked for the American Museum of Natural History where he did paintings reconstructing extinct animals .
