Green Terror vs Jack Dempsey

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Because in nature JDs most common predators are birds and reptiles,

their shyness is ingrained and well founded, most people keep them quarters that are too small, which exacerbates the shyness, and brings out aggression.
Where I snorkel with them, the average depth is 4ft or more, and they can dash into caves at the slightest shadow of a bird or anything else.
They are also quite social with other JDs, because the space allows, and only seem aggressive when protecting spawning sites.

 
I don't think the shyness of JD can be linked to the presence of predators. There are natural predators for all fish, and not just JD. Convict are often found in the same habitat as JD and they are not shy.
 
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