Duck Stalker

[NachtMystium]

Okay, so last Monday I woke up around 8 am to a plastic duck facing me on my porch...no clue who it could be.

Just about an hour ago, another fake duck was left on my porch. This was particularly weird because my door was open and my couch where I chill is right next to the door so it was left while I was sitting right there.

A little background:
upstairs garage apt. out of view from the street and you have to go through a yard to even get to the stairs.
hardly anyone knows where I live and it's completely out of character for anyone who does.

Looking for some ideas on DIY home surveillance or any ideas on how I can make sure that next time whoever is leaving the ducks on my porch is identified or any ideas at all to spot/capture/fuck with the weird duck-stalker.
Pic of the ducks:
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