Es tend to be a lot more active then PPs and most people Ive come to know over the years often say their crabs are a lot more vocal then to PPs. But, this isn't always the case, as many people have had vocal PPs.
![Smile :)](./images/smilies/icon_smile.gif)
And yeah, C_fiesta isnt incorrect in stating crabs being vocal when 'upset', some can get vocal when they are getting picked up (common practise back in the day)... so in a way they can be 'mad'.
I personally wouldnt worry.
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