Here are the two most easy-to-see differences between
butterflies and moths:
- Like the Imperial Moth, Eacles imperialis,
at the right, when moths are at rest usually but not always they hold
their wings flat against the surface they are resting on (butterflies
usually but not always fold their wings above them)
As the close-up of the head of the above Imperial Moth at the
right shows, moth antennae are divided into feathery
segments (they are said to be plumose)
MOTH IDENTIFICATION
Unless you are trying to identify one of the larger and fancier moth
species, moth identification is usually harder and less certain that butterfly
identification. That's because there are more kinds of moth than butterflies, and many
moth species are small, fairly unspectacular, brownish or grayish ones. You can see what I
mean by taking a glance at our Moth Families Page.
When you see all those names, remember that they are families, some of them with
many genera, and many of those genera having many species!
Most field guides with moths in them are for "butterflies and
moths," which means that butterflies are the main subject, but some of the more
common moths are included. Moth fanciers in eastern North America are lucky that A Field Guide to Moths of Eastern North America exists.
Montana State University's Butterflies and Moths of North
America Web site helps with identification by providing hundreds of thumbnail photos
to choose from. If you can figure out what family your moth belongs to, go to the above
site's Image Gallery,
choose the family in the box, and scan the thumbnails of all the members of that family on
file at the site.
You might practice this approach by
identifying the moth at the left. Can you figure out its family? Once you know its family,
can you find its thumbnail at the above site? With most web browsers you can see the
moth's name by placing your cover over the image.
If you live on the the US eastern coast you may want to try this
technique at the Moths of Maryland
Website where you can also click on a family and see photos.
It's a great help in moth identification if you have a
checklist of the species found in your area. Also, field guides with distribution maps for
each species help the identification process enormously. If you are in Maine, for
instance, you shouldn't have to try to distinguish your moth from a look-alike species in
Louisiana.
Another approach, once you know the family, on your computer type
the family's name into the box at the images" section of the Google search engine,. For example, if
you think you have some kind of sphinx or hawk moth, you'd type in "sphingidae,"
since that's the technical name of the Sphinx Moth Family. Then you'll see hundreds of
thumbnail pictures of various sphinx months at many websites all over the world, and maybe
one of them will be the species you are trying to identify. If you see a picture looking
like what you have, just go to the Web page where the image is found, and probably there
you will find the moth's whole name.
WAYS MOTHS PROTECT THEMSELVES
Moths protect themselves from predators in
some interesting ways. For example, can you figure out how the Polyphemus
Moth, Antheraea polyphemus, illustrated at the left, might cause a
hungry bird to go away? Notice how this moth's hindwings are adorned with what appears to
be eyes glaring at us. Well, if you were a bird about to pounce on the poor Polyphemus,
and the Polyphemus opened its wings and those big yellow eyes were suddenly staring at
you, wouldn't you think twice about gobbling it up?
The moth at the left, with the curious name
of "The Neighbor," Haploa contigua, isn't very
colorful, but its bold wing patterns take advantage of a special camouflage technique
known as disruptive patterning. In disruptive patterning, the outline of
an animal is broken up or blurred, making it hard for a predator to know what it is
seeing. Is "The Neighbor" one black and white insect, or six white insects on a
black background? Or maybe it's not an insect at all. The moment of confusion disruptive
patterning can bring about may be all the time an organism needs to escape being eaten!
Another way for a moth to confuse its predators is for
its camouflage to blend it in with its environment. The Rustic Sphinx, Manduca
rustica, at the right is clearly visible to us, but just imagine how hard it would be
to see it if it were quietly perched on a brown tree trunk thickly covered with gray
lichen! In the picture, notice the moth's long proboscis sticking into the flower's
throat, being used like a straw to suck up the flower's sweet nectar. This species is
found from the southern US south through Central America to Uruguay in South America.
THE GIANT SILKWORM MOTHS
The above Polyphemus Moth is a member of Giant
Silkworm Moth Family, the Satrniidae, and that's a moth family you
should know. This family is famous for its very large, showy moths -- with wingspreads up
to about 6 inches across (15 cm). Caterpillars in this family often bear spines or
tubercles, and are so large that their silken cocoons are sometimes confused with
hummingbird nests. At the right you see such a cocoon "not much larger than an
extra large chicken hen's egg," according to Maureen, who sent us the picture
from West Palm Beach, Florida. The adult moth has already emerged from the cocoon, as you
can see by the exit hole at the top of the cocoon, shown in the inset at the picture's
lower right. I think this is the cocoon of a Polyphemus Moth.You may enjoy
browsing Bill Oehlke's Large and Showy Moths (Saturniidae) of North America.
You may want to review some mothy books available at Amazon.com in
the US, Canada and the UK by clicking here. |
CHECK
OUT
THESE MOTH
BOOKS: |
|