Don't underestimate hawks!!! I had a run in with them a few years back and was amazed at what they can and will do! This is a longish story (but interesting, I think) - warning you ahead of time.
My hens free ranged in my backyard (I'm in the suburbs) and we built their coop under the balcony (deck?). There's lots of room under it and we have latice covering the perimeter except for a large entrance way for the riding mower which my dh keeps under the balcony. Okay, so this hawk starts hanging around and the first time we were alerted by the chickens' squawks, my dh went down to check on them and found a hawk UNDER an outdoor table that we had under the balcony. Okay, so I hang bird netting over the entrance way, and a day or two later, the hawk flies under the balcony (despite the bird netting) and scares out my little black silkie and kills her. I found it eating her when I went to give them some treats. NOW I'M
REALLY MAD!!! So, I take chicken wire and cover
all openings to get under the balcony. A couple of days later, I come home from substitute teaching and, when I pull up in my car, I see a hawk UNDER THE BALCONY trying to get out. It heard my car coming and it was trying to make a quick get-away. I got under the balcony and wasn't sure exactly what I was going to do but while I was trying to figure it out, the hawk managed to find a little space to escape. I found my pretty buff orp pullet I'd only had a week, totally gutted and quite a bit eaten. It looked like she ran behind a freezer sized metal box I kept their feed in and the hawk managed to get her (mind you, she was between the metal box and the wall it was up against) and eat her right there. Now I was baffled and the only way I could see that it managed to get in were some spaces where the lattice work met the balcony. The hawk would have had to fly under and up over the lattice to get in!! I covered the spaces with chicken wire and it never came back. I don't know if I deterred it or it was so freaked out by it's near encounter with me that it didn't want to take a chance coming back. Soo, after this "book" I wrote, you can see where a determined, hungry hawk will, indeed, enter places you would think were off limits!! Good luck with your predator, whatever it is!!!