A headstander is any of several species of South American fish, including Anostomus ternetzi, Anostomus anostomus (family Anostomidae) and members of genus Chilodus from the family Chilodontidae. The name derives from their habit of swimming at a 45° angle, head pointed downwards. The fish could `stand up` with its head while swimming. ==About=.....
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http://en.wikipedia.org/wiki/Headstander
any of several fishes of the families Chilodontidae and Anostomidae (order Characiformes). All species are small, reaching a maximum length of 20 cm ... [1 related articles]
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http://www.britannica.com/eb/a-z/h/27
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