Yes, it is completely a sad story. As you said we can see their unhappiness when they are not in their nature. The fact that is animals have their own needs, emotions, desires and nature. So that keeping them in small enclosures, pools and using them for human entertainment is harmful and cruel.

And visiting them in marine parks, aquariums, zoo is not fun or nature love. Maybe first of all, at this point, people should reach awareness and reach a consensus.