Here you can find a lot of different chitin and biological pieces which you can use to make your own scene.
Here is a lot of different pieces from smallest ( around 100 triangles) to bigest ( around 4500 triangles). Also it is include a lot of biological decals.
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Number of Unique Meshes: 141
Number of Materials and Material Instances: 4
Number of Textures: 14
Texture Resolutions: 4096x4096
Supported Development Platforms: