The man sighed and added seriously,
“Please don’t be alarmed, but you should take your daughter to a doctor right away.”

The parents exchanged confused looks.
“Why? Did something happen? Is it because of the otter? Is she sick?”

Then the zookeeper said something that left the parents speechless 
(Continued in the first comment )

“No, no,” he hurried to reassure them. “Everything’s fine. It’s just that… Luna is special. She’s lived here for five years, and during that time we’ve noticed something strange. Every time one of our visitors — especially a child — was sick, she behaved exactly like

this.”