The red finned tiddler, or "bottle-o" is so named because of the large red fins which beat rapidly to support the fish while walking on land.
The tiddler part of its name is derived from the peculiar "tiddle tiddle tiddle" cartoon noise that mysteriously occurs as its small pectoral fins carry it along.
The slang 'bottle o' is based on the similarity of its tail fin shape to a beer bottle opener.
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