The crossword solution for the term 'BIRD ON A BUCK' is 'EAGLE'. Eagles are large birds of prey that are found in many parts of the world. They are known for their powerful wings and sharp talons, which they use to hunt for food. Eagles are also known for their majestic appearance, often seen soaring high in the sky. They are a symbol of strength and freedom, and have been used as a national symbol in many countries.