The
Butterfly Lifecycle
Both butterflies
and moths have a life cycle consisting of four phases: the Egg, the Caterpillar
or Larva, the Pupa, and finally the Adult.
The Egg Phase:
Some species lay
only a single egg at a time, and others lay up to 400. Each egg can range in
size from 1mm to 4mm in diameter, and vary in shape and texture. In the egg
phase the egg begins to darken and if you look closely you will be able to see
the caterpillar moving about inside just prior to emerging into the world. The
caterpillar or larva cuts a small incision in the shell of the egg, which it
then pulls its body out into the world through. In most cases it will eat its
empty eggshell which provides it the necessary nutrients which it will need to
survive as it locates its favorite food.
The
Caterpillar Phase:
It is during this
phase where the caterpillar feasts on its choice food, in some species only one
or two plant types are edible. Growing and shedding its skin several times (up
to 6 times) until it is fully grown and ready to begin to pupate where it will
undergo a great transformation and shed its skin for the final time.
The caterpillar
will attach its self to a selected branch or stem by spinning a silken pad, then
attaches its tail to the pad. It next spins a loop of silk that passes around
the middle of the body and is then attached to the stem to provide support. The
caterpillar’s skin will then split along the back and the pupa begins to
emerge by way of wriggling movements. The old skin is forced towards the tail
and then released. A series of hooks on the tail are firmly attached to the
silken pad and the pupa takes on its final shape.
The Pupa
Phase:
It is during this
stage that the caterpillar takes on the form of a great moth or butterfly, and
becomes the most vulnerable to outside dangers. Just prior to emerging from the
cocoon, the colors can be dimly viewed. The pupa case or cocoon splits and the
butterfly begins to emerge, once it is completely free of the case it will
release meconium, a waste fluid that has collected during the pupa phase.
Did you know that
a Butterfly comes from a chrysalis, where a moth emerges from a cocoon, and that
a Moth uses it own silk to make its cocoon.
The Adult
Phase:
It is in this
stage in which a complete metamorphosis takes place, the transformation from the
Pupa stage to the actual Adult stage.
The butterfly
will rest with its wings hanging downward, and will expand them by forcing blood
into the wings veins. This entire process must happen quickly while the
butterfly wings are still damp, failure to do so would mean that the wings would
dry out and harden and become useless for flight. This entire process can take
up to an hour, thereby allowing the butterfly or moth to take flight to begin
feeding on nectar, or other food sources such as mud, rotten fruit, dung, or
sweat. It is during this stage where the adult will feed and then mate before
laying eggs and starting the whole cycle over once again.
The life span of
most adult butterflies or moth is 14 days or less depending upon the species.
There are some species like the Monarch and the Heliconius species that can live
up to around eight (8) months.
The Monarch (Danus
plexippus) butterfly migrates from the inner parts of Mexico up into all parts
of North America and even as far up as Canada. This migration takes place
each year and really is an event to see, because literally hundreds of thousands
of these creatures will be in flight at once.