Parameter Tree:
EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > HEXAPODS > INSECTS

Definition:
Insects are a class of Arthropoda, members of which have three pairs of
legs and usually two pairs of wings borne on the thorax.  


Reference:
Allaby, M. 1998. A Dictionary of Ecology. Oxford University Press. Oxford, New
York.