Cyathus stercoreus
![The basidia of C. stercoreus during various stages of development. (1) young basidia of usual form; (2) a double basidium; (3–6) basidia with 4 to 8 developing spores; (7–9) basidia collapsing, with spores still attached; (10) a collapsing basidium with two spores still attached, and one separated.[6]](/uploads/202501/07/Cyathus-stercoreus-basidia2448.jpg)

Cyathus stercoreus, commonly known as the dung-loving bird's nest, is a species of fungus in the genus Cyathus, family Nidulariaceae. Like other species in the Nidulariaceae, the fruiting bodies of C. stercoreus resemble tiny bird's nests filled with eggs. The fruiting bodies are referred to as splash cups, because they are designed to use the force of falling drops of water to dislodge and disperse their spores. The species has a worldwide distribution, and prefers growing on dung, or soil containing dung; the specific epithet is derived from the Latin word stercorarius, meaning "of dung".