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What is a Butterfly?
Butterflies are beautiful, flying insects with large scaly
wings. Like all insects, they have six jointed legs, 3 body parts, a pair of
antennae, compound eyes, and an exoskeleton. The three body parts are the head,
thorax (the chest), and abdomen (the tail end).
The butterfly's body is
covered by tiny sensory hairs. The four wings and the six legs of the butterfly
are attached to the thorax. The thorax contains the muscles that make the legs
and wings move.
FLYING
Butterflies are very good fliers. They
have two pairs of large wings covered with colorful, iridescent scales in
overlapping rows. Lepidoptera (butterflies and moths) are the only insects that have scaly wings.
The wings are attached to the butterfly's
thorax (mid-section). Veins support the delicate wings and nourish them
with blood.
Butterflies can only fly if
their body temperature is above 86 degrees. Butterflies sun themselves
to warm up in cool weather. As butterflies age, the color of the wings
fades and the wings become ragged.
The speed varies among butterfly species (the poisonous varieties are slower
than non-poisonous varieties). The fastest butterflies (some skippers) can fly
at about 30 mile per hour or faster. Slow flying butterflies fly about 5 mph.
LIFE-CYCLE OF A
BUTTERFLY
Butterflies and moths undergo complete
metamorphosis in which they go through four different life stages.
- Egg - A butterfly starts its life as an egg, often laid on a leaf.
- Larva - The larva (caterpillar) hatches from an egg and eats leaves
or flowers almost constantly. The caterpillar molts (loses its old skin) many
times as it grows. The caterpillar will increase up to several thousand times
in size before pupating.
- Pupa - It turns into a pupa (chrysalis); this is a resting stage.
- Adult - A beautiful, flying adult emerges. This adult will continue
the cycle.
DIET
Caterpillars spend most of their time eating leaves using strong mandibles
(jaws). A caterpillar's first meal, however, is its own eggshell. A few
caterpillars are meat-eaters; the larva of the carnivorous Harvester butterfly
eats woolly aphids.
Butterflies and moths can only sip liquid food using a tube-like
proboscis, which is a long, flexible "tongue." This proboscis uncoils to
sip food, and coils up again into a spiral when not in use. Most butterflies
live on nectar from flowers. Some butterflies sip the liquid from rotting fruits
and a rare few prefer rotting animal flesh or animal fluids (the Harvester
butterfly pierces the bodies of woolly aphids with its sharp proboscis and
drinks the body fluids).
HABITAT
Butterflies are found all over the world and in
all types of environments: hot and cold, dry and moist, at sea level and high in
the mountains. Most butterfly species, however, are found in tropical areas,
especially tropical rainforests.
Many
butterflies migrate in order to avoid adverse environmental conditions (like
cold weather). Butterfly migration is not well understood. Most migrate
relatively short distances (like the Painted Lady, the Red Admiral, and the
Common Buckeye), but a few (like some Monarchs)
migrate thousands of miles.
CLASSIFICATION
Butterflies
and moth belong to the order Lepidoptera. Lepidos is Greek for "scales" and
ptera means "wing". These scaled wings are different from the wings of any other
insects. Lepidoptera is a very large group; there are more types of butterflies
and moths than there are of any other type of insects except beetles. It is
estimated that there are about 150,000 different species of butterflies and
moths (there may be many more). There are about 28,000 butterfly species
worldwide, the rest are moths.
BUTTERFLY FOSSILS
Butterfly fossils
are rare. The earliest butterfly fossils are from the early Cretaceous
period, about 130 million years ago. Their development is closely linked to
the evolution of flowering plants (angiosperms)
since both adult butterflies and caterpillars feed on flowering plants, and the
adults are important pollinators of many flowering plants. Flowering plants also
evolved during the Cretaceous period.

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Updated March 2007
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