When Constant geyser reaches the peak of the eruption cycle, water overflows from the geyser pool and flows down into the
pool and vent of Whirligig geyser. On a number of occasions, I watched this process take place and almost immediately afterwards,
the input of heated water caused the start of a Whirligig eruption.
Observations such as this demonstrate just how
delicately balanced and inter-related are the geyser systems in this fragile environment.