A pair of biologists are studying terns on a

rock island just off the coast. While walking on a distant part of
the
island, they are shot at by a group of thugs operating a pot
farm. This
happens several times and the local law enforcement
refuses to
investigate.

On their last day on the island they
happen into a huge pile of
harvested grass that has been set out to dry.
Quickly they decide to set it on
fire to pay the thugs back for
shooting at them. The fire takes off and
sends plumes of smoke into
the sky. As they are running for their boat,
they notice that the
soaring birds are acting weird, spiraling out of
control and crashing
into the trees.

The next day they read the headlines in the
local paper:

Pot Farm Burns – No Tern Left Unstoned.