This seems unlikely to Yoongi, but what does he know? He's not a marine biologist or an aquarium employee. For all he knows, they do exactly that. It's distracting when he can feel Jungkook's fingers at his hem, when what he really wants is to press him into the glass and kiss him. He settles for resting one hand against the glass alongside Jungkook's head, trying to look casual about it. It helps that, even now, the flick of a shark's tail draws his attention upward.

"And tag them," he muses, "so they can track and study them in the wild. That would make sense." He's halfway convinced himself of it, now that he's said it. It isn't necessarily likely still, but it's plausible, and he's willing to let Jungkook hold onto the idea instead of dispelling it for the sake of being realistic. "And they don't have to worry about other predators in here or finding food."