What is the primary benefit of feeding dark meats to raptors compared to white meats?

Feeding raptors dark meats is primarily beneficial due to their higher energy density compared to white meats. Dark meats, such as those found in the muscles of birds that fly frequently, contain a greater concentration of myoglobin, which allows for improved oxygen storage and delivery during prolonged activity. This characteristic makes dark meat richer in nutrients and energy, vital for raptors that need to maintain high levels of energy for hunting and daily activities.

In contrast, other options do not provide the same benefits. Lighter weight does not contribute to the energy needs of raptors; while a lower caloric value would not be advantageous for their energy requirements, as raptors rely on nutrient-dense food sources to sustain their energy levels. Lastly, the digestibility of dark versus white meat varies depending on individual species and the specific type of meat, but this factor is not the primary reason dark meats are favored in a raptor's diet.