Why do falconers typically avoid feeding pigeons and doves' heads, crops, or internal organs to raptors?

Falconers typically avoid feeding pigeons and doves' heads, crops, or internal organs to raptors primarily because these parts may contain harmful germs. Birds like pigeons and doves can be carriers of various pathogens and parasites that are not easily visible and can pose health risks to raptors. Internal organs may harbor bacteria or toxins that could lead to illness if ingested. Ensuring the health and wellbeing of the raptors is paramount, and avoiding potentially contaminated food sources is a crucial practice in falconry to prevent diseases that could affect the birds' performance and longevity.

While the other options suggest aspects related to nutritive content and digestion, the primary concern with feeding these specific parts lies in their potential to harbor harmful germs, making option B the most relevant and precise reason for this feeding practice in falconry.