Insects are a group of arthropods that like the rest of artropods, they
have an EXOSKELETON (outside skeleton)
and they include beetles, dragonflies, flies, butterflies, ants...
They are the most diverse group of animals
on the Earth, with over a million described species.
The body is organized into three
regions or segments: a HEAD, a THORAX,
and an ABDOMEN.
The
head supports a pair of sensory ANTENNAE,
and a pair of COMPOUND EYES.
In most of insects, the
thorax has 6 LEGS (one pair per segment)
and two or four WINGS. Insects are the
only invertebrates to have developed flight.
The abdomen has most of the digestive,
respiratory, excretory and reproductive internal organs.
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