They've only been spotted by a select few of us. How is that possible? How did they get here?

It appears that increasing numbers of them are appearing as the months go by, but no human has ever understood how they came to be or why... they seem to be attaching themselves to us. They seem harmless— in fact; they seem to make their human counterparts feel... better! Healthier even. 

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I can't wait to get a chance to meet one! I wonder if they'll take to me?