Which bird adaptation is probably less well-developed in flightless birds such as penguins and ostriches?

Name: Which bird adaptation is probably less well-developed in flightless birds such as penguins and ostriches?
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Question

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The honeycombed bone structure is an important adaptation for flight in birds, as it makes their bones lighter and stronger. However, since flightless birds such as penguins and ostriches do not need to fly, this adaptation is probably less well-developed in them.

Which Bird Adaptation Is Probably Less Well-Developed in Flightless Birds