I was pleasantly surprised by how well this window cling held a hummingbird feeder to my window. It’s just clear plastic, so I was a little skeptical at first. I anticipated it would snap, or melt in the hot sun, but so far it’s held up well and suctions well to the window. It hasn’t fallen off and I haven’t seen any issues so far. I wasn’t sure if the hummingbirds would come that close to a window, but they don’t seem to mind.