in the transportation mini car, a woman sell cricket insect 0.3 usd,
i buy one cricket in the small bamboo, and write this to my diary.
http://en.wikipedia.org/wiki/Cricket_(insect)
Crickets, family Gryllidae (also known as "true crickets"), are
insects somewhat related to grasshoppers, and more closely related to
katydids or bush crickets (family Tettigoniidae). They have somewhat
flattened bodies and long antennae. There are about 900 species of
crickets. They tend to be nocturnal and are often confused with
grasshoppers because they have a similar body structure including
jumping hind legs.
Crickets are harmless to humans, as crickets are not aggressive toward
humans and rarely attack.
Only the male crickets chirp. A large vein running along the bottom of
each wing has "teeth," much like a comb does. The chirping sound is
created by running the top of one wing along the teeth at the bottom
of the other wing. As he does this, the cricket also holds the wings
up and open, so that the wing membranes can act as acoustical sails.
It is a popular myth that the cricket chirps by rubbing its legs
together.
There are four types of cricket song: The calling song attracts
females and repels other males, and is fairly loud. The courting song
is used when a female cricket is near, and is a very quiet song. An
aggressive song is triggered by chemoreceptors on the antennae that
detect the near presence of another male cricket and a copulatory song
is produced for a brief period after successful deposition of sperm on
the female's eggs.[citation needed]
Crickets chirp at different rates depending on their species and the
temperature of their environment. Most species chirp at higher rates
the higher the temperature is (approximately 62 chirps a minute at
13°C in one common species; each species has its own rate). The
relationship between temperature and the rate of chirping is known as
Dolbear's Law. Using this law it is possible to calculate the
temperature in Fahrenheit by adding 40 to the number of chirps
produced in 14 seconds by the snowy tree cricket common in the United
States.[1]
Crickets, like all other insects, are cold-blooded. They take on the
temperature of their surroundings. Many characteristics of
cold-blooded animals, like the rate at which crickets chirp, or the
speed at which ants walk, follow an equation called the Arrhenius
equation. This equation describes the activation energy or threshold
energy required to induce a chemical reaction. For instance, crickets,
like all other organisms, have many chemical reactions occurring
within their bodies. As the temperature rises, it becomes easier to
reach a certain activation or threshold energy, and chemical
reactions, like those that occur during the muscle contractions used
to produce chirping, happen more rapidly. As the temperature falls,
the rate of chemical reactions inside the crickets' bodies slow down,
causing characteristics, such as chirping, to also slow down.
Crickets have tympanic membranes located just below the middle joint
of each front leg (or knee). This enables them to hear another
cricket's song.
In 1975, Dr. William H. Cade discovered that the parasitic tachinid
fly Ormia ochracea is attracted to the song of the male cricket, and
uses it to locate the male in order to deposit her larvae on him. It
was the first example of a natural enemy that locates its host or prey
using the mating signal[2]. Since then, many species of crickets have
been found to be carrying the same parasitic fly, or related species.
In response, a mutation leaving males unable to chirp was observed
amongst a population of field crickets on the Hawaiian island of
Kauai.
Crickets are omnivores and scavengers feeding on organic materials, as
well as decaying plant material, fungi, and some seedling plants.
Crickets also have been known to eat their own dead when there is no
other source of food available, and even exhibit predatorial behavior
on other weakened or dead crickets. Crickets have relatively powerful
jaws, and have been known to bite humans, mostly without breaking the
skin. The bite can, however, be painful when inflicted on sensitive
skin such as the webbing between fingers.
Crickets mate in late summer and lay their eggs in the fall. The eggs
hatch in the spring and have been estimated to number as high as 2,000
per fertile female.[citation needed] Subspecies Acheta Domestica
however lays eggs almost continually, with the females capable of
laying at least twice a month. Female crickets have a long needlelike
egg-laying organ called an ovipositor.
Crickets are popular as a live food source for carnivorous pets like
frogs, lizards, tortoises, salamanders, and spiders. Feeding crickets
with nutritious food in order to pass the nutrition onto animals that
eat them is known as gut loading. In addition to this, the crickets
are often dusted with a mineral supplement powder to ensure complete
nutrition to the pet.