October 21, 2003 Creatures
in Need of a Press Agent Week
Creatures
in Need of a Press Agent Week -- Candidate No. 2- The Spider
Myth:
Spiders bite while we're asleep. Fact: Although it is possible to have been bitten by a spider,
the vast majority of bites are from common insects like mosquitos and
flies. In fact, spiders do not seek out humans because we have nothing
to offer them in the way of food. They eat insects that they catch and
immobilize. Spider bites usually result from direct, inadvertent contact
that disturbs or threatens the animal.
Myth:
Spiders, just like many insects, invade our houses as the weather
changes. Fact:
First of all, spiders are not insects - they are arachnids (Class Arachnida).
Secondly, the spiders that live within our houses are very likely species
that have always lived there and are adapted to the rather water scarce
and sometimes food scarce environment. In fact, putting a spider "back
out where it belongs" may well lead to its demise. Remember, as the
perennial guests that they are, they perform a rather valuable function
of capturing insects that might otherwise pester or bite.
Myth:
Spiders are not good to have around because their bites are dangerous. Fact:
Almost all spiders are venomous, meaning that they are capable of secreting
a chemical that is used to immobilize their prey. A minority of spider
species have venom that can cause localized pain in humans, like the venom
of bees or wasps. (Bees and wasps are far more dangerous than spiders,
however; wasps cause many deaths annually). Of around 50,000 spider species
known, only about 25 (1/20 of 1 percent) have venom capable of causing
illness in humans, to a greater or lesser extent. In any given locality
you can expect to find from zero to (at most) three such species. The
Spider Myth Site www.washington.edu/burkemuseum/spidermyth/index.html
provided some of the information for this piece.
Today's
photo is of a Black & Yellow Argiope (Argiope aurantia) taken
by WPC Member John M. Karian, who does nature photography in Venango County.
In
keeping with the upcoming month-ending holiday, the week of October 20th
through the 24th, WPC Daily will feature five creatures who have a reputation
of being "scary." We will present facts that, hopefully, will
dispel some myths and will invite you to vote for your favorite. The winning
photo will be announced on Thursday, October 30, when all participants
will be able to download a screensaver of the entire group in time to
celebrate Halloween.