bioconstruction
structure built by living organisms, by opposition to sedimental process
web decoration
conspicuous, usually zig-zagged, silk structure in some orb-weaver spider webs
beaver dam
dam constructed by beavers
coral reef
ridge of rock in the sea formed by the growth and deposit of coral
sponge reef
reefs produced by sea sponges
spider web
silk structure woven by a spider, designed to catch prey