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A wing is a screw
Lumen · High school
Pettigrew: a bird's wing rows air in a figure-8. Structurally a screw. Functionally a screw. The 8 opens into a wave as the animal goes forward. Not a survey of gaits.
Student age
10years · 5th grade
Lumen · High school
Pettigrew: a bird's wing rows air in a figure-8. Structurally a screw. Functionally a screw. The 8 opens into a wave as the animal goes forward. Not a survey of gaits.
Student age
10years · 5th grade