Locusts are large grasshopper-like insects. They vary in colour depending on the species - normally brown in colour.
Like true insects they have 3 pairs of legs, the hind legs being the largest and are used for jumping. They have two pairs of wings, the outer pair being harder and used to control flight, while the lower pair are more membranous and are used for flight.
Locusts normally solitary, but become gregarious under favourable conditions and will swarm. Swarms of locusts (millions of individuals) are a serious pest during certain years particularly in Africa and Australia where they can literally decimate and entire field to the ground within an hour.