What is a likely sign of a tapeworm infestation in raptors?

A likely sign of a tapeworm infestation in raptors is watery mutes with no change in appetite. This symptom occurs because tapeworms can interfere with nutrient absorption while the raptor may still maintain its normal feeding behavior. As a result, the bird might appear to have a healthy appetite but experience digestive issues that lead to the production of watery droppings, which is a clear indicator of a parasitic infection.

The other options highlight symptoms that can be associated with various health issues but are not specifically indicative of a tapeworm infestation. Excessive shedding of feathers can be linked to stress or other health problems, constant vocalization might indicate discomfort or other behavioral issues rather than a specific parasitic infection, and weight gain can suggest overfeeding or other unrelated conditions, which does not correlate with a tapeworm infestation that typically results in weight loss due to malnutrition despite normal food intake.