I tend to slow to 250 below about 12,000 if I can get away with it.
I got in the habit flying to coastal airports (pelicans) and high-altitude airports in water-fowl country. The high altitudes airports were more of a risk IMO because there are a lot more geese than pelicans in the world, and at some airports you can legally cruise at 300+ kts at 10K MSL but that might be only 4K or less AGL.
I'm not at all confidant that my windscreen can take a goose at 250, but I'm absolutely certain it won't take a pelican at 320.