I had this happen last year and thought I'd share. I used to leave my patio door open because I was building a coop for my chickens. I'd raised the chickens indoors as babies, and they had nests on the patio and would come in at night to sleep there. The food and water was there so they could come in from the rain. So I had to leave the screen door open. I noticed after a while that my pitchers had rips and didn't know what was happening until I finally caught the culprit. It was a Carolina Wren that would come and go as he pleased. He would steal the bugs the pitchers had caught by ripping them and getting them out. I had mixed feelings about this because I love birds as much as I love nepenthes. I was concerned about him being in the miranda since he could fall in the pitchers and I won't let that happen either. Anything else yes, but not birds. But this guy was very confident and agile. He ate the spiders on the walls, investigated my bird cages and even killed a Sphinx Moth I didn't know was inside as well. Another thing I love. I raise Sphinx Moths. Here's the video.