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This fluid dynamics video demonstrates the capabilities of an experimentalsetup to visualize organisms burrowing in granular substrates. The setupconsists of a tank filled with 1mm soda-lime glass beads, backlit by halogenlights. The walls can be moved such that the space bound by them can expand orcontract to fit various organisms. A recirculation system oxygenates and coolsthe salt water that flows through the substrate. The video shows the burrowingbehavior of a razor clam (Ensis directus) and a quahog (Mercenaria mercenaria).Both animals inflate their foot with blood, making the foot a terminal anchoragainst which they pull their shell downwards. Deformation of the granularsubstrate can be seen around the animals as they advance downwards.

Visualization System for Burrowing Organisms in Granular Substrates