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It seems that the Coast chapters of Half-Life 2 were originally to feature a Barnacle variation named "Sand Barnacle". It was never finalized; it has no AI, no animations, and its textures are very basic, although other textures not featured on the model and more finalized can be found in its texture folder. It is unknown what behavior differences it was to have with the standard Barnacle, if any. Given the model orientation in the model viewer, it seems it was to stand on the ground instead of ceilings like the standard Barnacle.
- Half-Life 2 leak files