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Apple QuickTime Audio  |  1996-08-01  |  2.0 MB  |  1 channel  |  44,100 sample rate  |  1 minute, 29 seconds
Transcription: Treasure 18 Evolutionary Tree of Fishes No exhibit could show all of the 25,000 known species of fish alive today. But by using key examples, this display shows how they evolved and how they are related. Like the display of fossil horses, Treasure 47, this elegant exhibit uses a method called cladistics to show how fishes evolved. Cladistics is a way of grouping organisms strictly according to their genealogical relationships. Take rays, for example, near the center of the group, just following the sharks. They all have flat bodies, large pectoral fins, eyes on the tops of their heads, and gil ...