"CC." I said to my client (still holding tight to the wriggling jellyfish's tentacle), do you happen to have any unusual identifying marks--so we won't confuse you with your look-alike crayfish?"
"Well, yes." he sheepishly replied. "When I was a young crawdad it was a very popular thing to get a tattoo and I got one. It's sort of faded now, but you can easily see it on my claw--see?" and he held the claw out for my inspection.
Sure enough--there was the tattoo of a rose on his claw and when I glanced at the other pale blue crayfish's claw--thank goodness--there was no tattoo!