Which one of the following organisms bears hollow and pneumatic long bones?

The question asks which organism possesses hollow and pneumatic long bones.

Hollow, pneumatic bones are a characteristic feature of birds. These bones contain air-filled cavities connected to the respiratory system, making them lightweight yet strong, which aids in flight.

Among the listed options:

• Macropus – a marsupial (kangaroo); its bones are solid, not pneumatic.
• Ornithorhynchus – the platypus, a monotreme mammal; its bones are also solid.
• Neophron – a genus of Old World vultures, which are birds; therefore they have hollow, pneumatic long bones.
• Hemidactylus – a genus of geckos, reptiles with solid bones.

Only the bird genus Neophron matches the description, so it is the correct answer.