There are many meaning of perch, the most common being a resting place for a bird. A perch was also a unit of measure of length which was equal to 5.5 yards or 5.1 meters. You can find more information here: dcda.org.uk/Cartography/3detailed.html.
A perch is somewhat long and rounded. True perch have "rough" or ctenoid scales. On the anterior side of the head are the maxilla and lower mandible for the mouth, a pair of nostrils, and two lidless eyes.
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