Hey, that's me!  (Yes, an image of the illusive tiger duckie in action...) 

Merriam Webster says that a stalker pursues quarry or prey stealthily.  Hm.  Stealthily?  Perhaps, but certainly not subtlety!   I would say that a stalker is a duckie who is very tenacious in regards to hounding authors for new installments of their stories.

 

Not surprising...take me back to the faq...