Whenever you see a movement out of the corner if your eye, or hear the rustle of scales behind you. Check for the smell of a well poured macchiato, and if you do smell that, the Catmeleon is more than likely present.
The lesser known Monks of Do 'me have a little song about the Catmeleon.
"You will never know
When it does not show
A flicker a flash
Who can tell
A Catmeleon by its
Note the Monks of Do 'me are not true Baristas and must never be confused with them.