At the zoo, a little girl was playing with an otter, petting it and laughing with joy: everyone was touched by the heartwarming scene — until a zookeeper suddenly approached the parents and said unexpectedly, “You need to take your daughter to a doctor immediately.” 
That day, the family visited a petting zoo — a place where children could not only see animals from afar but also feed, touch, and even play with them. For their little girl, it was a real adventure.
“Mom, look at that huge turtle!” she shouted, running from one enclosure to another.
“Dad, can we have rabbits like these at home? They’re so fluffy!”
Her parents laughed, delighted by her excitement.
When they reached the otter enclosure, the girl suddenly froze with joy.
“Mom, look! It’s swimming toward me!”
One of the otters really did swim to the edge of the pool, climbed onto a rock, and stretched out its tiny paws toward the girl.
The girl crouched down and began to stroke its wet fur. The otter didn’t run away — on the contrary, it pressed against her knee, touched her hands, and twitched its whiskers as if sniffing her.
Everyone around smiled; the scene was so touching that many stopped to watch.
But suddenly, the otter stopped playing. It began circling nervously, swam back to the girl, touched her belly, then dove into the water again, swam along the edge, and resurfaced beside her. Its movements grew restless — it whimpered softly and tapped its paws on the rock.
“She’s probably just tired,” the father said with a smile. “Let’s move on.”
When they left the otter area, a man in a zoo uniform approached them.
“Excuse me,” he said gently. “I work here. Were you just at the enclosure with our otter named Luna?”
“Yes, she’s adorable,” the mother replied with a smile.
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 
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“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.”
“Sick?” the mother repeated, turning pale.
“Yes. One boy she ‘sniffed,’ just like your daughter, was later diagnosed with a tumor in its early stages. She can sense smells we can’t detect. Maybe you’ll think it’s a coincidence… but if I were you, I’d have your child checked.”
The parents were speechless. At first, they didn’t believe it, but the man’s words kept echoing in their minds. The very next day, they went to the hospital.
After the examination, the doctors said:
“It’s a good thing you came. The illness is in its early stage, and we can treat it.”
Later, when they returned to the zoo, the girl walked up to the otter’s enclosure and whispered softly:
“Thank you, Luna.”
