The trap is stimulated by movements of the water,
maybe by touches of larger animals. During our
observations, we often found large insect larvae,
tadpoles, water beetles, leeches and other animals
that may stimulate some traps by touching, but are
too large themselves to be sucked in. Furthermore,
all test plants grew next to the water surface
where wind and rain may serve as mechanical
stimulants. Long filamentous algae ensnarled with
the trap's bristles could facilitate this power
transmission.