You'll notice that you can identify everything in all
the other carvings as things you've seen before. This one shows a
monster that resembles other drawings of Nessie. (That's why it's
here on this site.) The Perth Museum calls this drawing a "Pictish
Beast." (Word buffs may be happy to note that these carvings
were made by people we call the Picts. The word graph means draw. So
a pictograph originally was a drawing by a Pict. Drawings on stone
are also called petroglyphs. Petro means rock and glyph means
writing. A petroglyph is writing on stone. Our word
picture also comes from the Picts.)
This stone is on display at the Perth
Museum in Perth Scotland. It was photographed by Martin McCarthy.
You can see more Pictish carvings here: http://www.ancient-scotland.co.uk/pict1.html
This picture is used with permission.