Locust

Locusts are the swarming phase of certain species of
short-horned grasshoppers in the family Acrididae.
These are species that can breed rapidly under suitable
conditions and subsequently become gregarious and
migratory when their populations become dense
enough. They form bands as nymphs and swarms as
adults. Both the bands and the swarms are nomadic and
rapidly strip fields and greatly damage crops. The adults
are powerful fliers; they can travel great distances,
consuming practically all green material wherever the
swarm settles.[1]
The origin and apparent extinction of certain species of
locust—some of which grew to 6 inches (15 cm) in
length—are unclear.[2]
Locusts are edible insects, and are considered a delicacy
in some countries. There have been references to their
consumption as food throughout history.[3] On
swarming they are known to produce a toxin that
renders them inedible and causes a skin reaction in sunlight.