If a hawk's crop is distended and has an unpleasant smell, what condition is most likely present?

The condition associated with a distended crop that has an unpleasant smell is referred to as a sour crop. This occurs when the food in the crop undergoes fermentation due to the growth of bacteria, creating a foul odor. Sour crop is typically a result of improper digestion or feeding practices, which can lead to the accumulation of undigested food and bacteria in the crop, resulting in a distended and smelly condition.

In contrast, myiasis relates to infestations by maggots in tissues and would typically present with different symptoms, while frounce is a condition caused by a parasitic infection affecting the digestive tract of birds and would not specifically cause a distended crop with a foul smell. Aspergillosis is a fungal infection that affects the respiratory system and can lead to other symptoms unrelated to the crop's condition. Therefore, sour crop is the correct answer because it directly corresponds to the symptoms described, focusing on the crop's state and associated odors.