Regarding birds: In North America it isn't uncommon to see 9-10kg geese at 10,000’, and there are other species that'll get to 14,000. See Hudson river ditching for the performance enhancing effects of geese. In ‘81 a lear pilot got decapitated by a duck at Cincinnati at 3,800’ on departure
The Airbus I fly displays a speed exceedance message like (apparently) the 717. I am fairly sanguine about the prospect of encountering a large migratory waterfowl in Australia at altitude. I do so like flying fast below ten though, because it can save several precious seconds on each arrival. So I can then wait longer for ground transport.