Unidentified Furry Object

I found this mysterious object
on a peaceful Sunday afternoon.

Please take a look at the picture below.

                                         

              

                      

You can see a small innocent fur ball toy.

Then please look at this picture taken 30 minutes later.

                                         

It appears that the fur ball grew bigger in 30 minutes.
I bought this fur ball toy for myself but its manual
did not say anything about ball growing bigger.

Unfortunately, it disappeared while I was
calling the toymaker. The customer service
personnel said it should not change size.
So it remains a mystery what this fur ball actually was.