Some Nudibranchs exemplify queerness through a unique mating behavior known as penis fencing. Here, two individuals compete for their reproductive roles by attempting to stab each other with their penises; the one that wins typically assumes the role of the sperm giver, while the other becomes the egg provider, highlighting their simultaneous hermaphroditism and fluid gender roles. Nudibranchs are incredibly diverse, with over 3,000 known species inhabiting oceans worldwide, ranging from shallow tropical reefs to deep-sea environments. While they are not currently classified as a single endangered group, many species lack formal IUCN assessments and are vulnerable to habitat degradation, pollution, and the impacts of climate change—including significant shifts in their geographic ranges. Because many narrow-range habitat specialists remain unstudied, the true conservation status of these species is often difficult to determine, making the protection of their marine ecosystems vital for their continued survival.

Nudibrachs: dependent per species & often lacks biodiversity status assessments