What is the correct course of action in this situation?

In this situation, you correctly selected both "reduce my speed further" and "be ready to brake." When you see a warning sign for wildlife crossing, especially before a curve that limits your view, German traffic regulations require you to slow down and drive with particular caution. This is because animals can suddenly appear on the road, and if you’re driving too fast, you may not be able to stop in time. Reducing your speed and being prepared to brake help ensure you can react safely and avoid accidents. Emergency braking should only be used if animals are actually on the road and there is no other way to prevent a collision. In summary, always reduce speed and be alert for hazards when warning signs and poor visibility are present, as this is both safer and legally required.