Did you collect all the rabbits in the area at the top right? And have you made sure all your map spaces have been filled out? You won’t see rabbits hidden in unvisited tiles. (Tiles you CAN’T visit fill out automatically when in relevant adjacent areas– if an area isn’t filled, you can get to it.)
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I think that's the hint I needed. 😊 You're right that I couldn't tell that certain tiles were unvisited and accessible. I found two in the upper right, and so there's one left, which is probably in a tile that looks like it's unfilled and therefore accessible as you say. (Columns 5 and 6, row 2.)
Edit: That was it! Thanks!