Swelling and open sores on the footpad are signs of which condition?

Swelling and open sores on the footpad are indeed indicative of bumblefoot, which is a common condition in birds, especially raptors. Bumblefoot, or pododermatitis, arises due to infections or pressure sores, typically caused by unsanitary conditions, inappropriate perching surfaces, or obesity. The open sores and swelling are a result of bacterial infections that develop in the footpads.

In contrast, Aspergillosis is a fungal infection that primarily affects the respiratory system and does not cause footpad issues. Coccidiosis is a protozoal infection affecting the intestinal tract, leading to gastrointestinal symptoms, and is unrelated to the condition of the foot. Therefore, bumblefoot is distinctly characterized by the specific symptoms noted, making it the correct choice in this scenario.