Now it is necessary to determine whether the grasshopper is an adult or a nymph. Adults have fully formed wings which often extend to or beyond the end of the abdomen, and often fly away when approached. Grasshoppers develop gradually through 4-6 nymphal stages (instars), all of which are characterized by different states of partial wing development. Within a species, each subsequent instar is larger than the one before. But size is not a reliable indicator of age because species and sexes can be very different in size at the same instar, and late instars of some species can be larger than adults of other species. The following nymphal pictures are all of 3rd instars.

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Grasshopper is a nymph...
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Grasshopper is an adult...
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