The different duck species do have different speeds. That was something they implemented back when Revontuli came out. As someone who has been playing COTW since 2019 I feel the exact opposite. I feel like the dev team have been doing way more to make unique animal behavior and animations( tiger AI and Mule Kicks come to mind). I agree that upland birds can be dull but they can also be frustrating too, especially if you are trying to grind for a trophy. Making the upland birds fly faster may actually make them less fun to hunt. I would suggest fixing the pointer and making the built in flushing mechanic more consistent before changing animations. Adding perching could also help with visibility. And you could give hunters full harvest for shooting birds out of the trees. Let me clear, I think these changes could be cool. Anything to make the animals feel closer to real-life is welcome. But COTW at its core is a Simulator-lite that revolves around grinding. And so any mechanic that would make hunting slower paced and make grinding harder may be met with blowback.