Ultra-fast underwater suction traps are making the news. Ultra-fast cameras mean that the trap action of the Bladderwort can be investigated in greater detail than before. One finding of the study is that some traps can be metronymic, firing every five hours or so. One interesting idea in the paper is that this regular activation of the trap could be a deliberate strategy to ingest phytoplankton and bacteria to aid digestion. Previously this stuff was thought of as a bycatch.
h/t Cosmos Magazine