A rigid box that swimsSourced
Yellow boxfish move despite their stiff covering
Yellow boxfish have a rigid, box-like carapace around the head and body, with openings for the mouth, fins and other structures. They use their fins to move through complex reefs. A flexible, streamlined trunk is not the only arrangement that permits swimming.
A box-shaped body can still navigate water.
Summary / translation: Unbubly · CC BY-SA 4.0
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Yellow boxfish · Wikimedia contributors
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Reviewed: 2026-10-05