A raptor is most likely to gain the most weight from which type of food?

A raptor is most likely to gain the most weight from duck when considering the available food options. Ducks are generally larger and have a higher fat content compared to the other choices. This makes duck an excellent source of calories and nutrients for a raptor, allowing them to efficiently build body mass and store energy.

While chicken necks do provide necessary protein, they lack the substantial caloric content that larger prey like duck offers. Washed meat may vary significantly in nutritional value and may not provide the same benefits as whole animals. Rabbits, while they are a common prey species for many raptors, tend to be leaner than ducks and therefore might not provide as much weight gain per meal. Overall, the nutritional density and overall size of duck make it the most advantageous food choice among the options listed for weight gain in raptors.