How to keep iguanas off patio?

I wish I was kidding.

I moved into a very cute apartment the only downside is sometimes it feels like a wildlife reserve! I've had ducks on my back patio and recently iguanas have begun to show up. I'm growing plants in raised beds and am worried once they start growing more they'll become snacks.

As iguanas can climb and it's an apartment I can't erect a very large fence. Wondering if anyone has any suggestions (or small fence reccomendations that are unscaleable) as to how to keep them out and away?