Yes, birds do have bone marrow, but it differs from that of mammals in some ways. In birds, many of the bones—especially those that are important for flight—are pneumatic, meaning they are hollow and connected to the respiratory system to reduce weight. However, not all bird bones are hollow; the non-pneumatic bones, such as those in the legs and some parts of the wings, contain bone marrow. This marrow is involved in the production of blood cells, similar to how it functions in mammals.
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