https://www.sciencenews.org/article/larvaceans-underwater-snot-palaces-boast-elaborate-plumbing
Larvaceans' underwater 'snot palaces' boast elaborate plumbing
Jun 15, 2020 - Mucus houses have valves and ducts galore that help giant larvaceans extract food from seawater.
underwatersnotpalacesboastelaborate