Sentences with phrase «resort.the black widow»

Black widows have a cocktail of neurotoxins that enhance the effect of its main component a lpha - latrotoxin.

Pain and symptoms begin to subside.Most recover completely within 3 - 5 days.Weakness and occasional spasms can persist for weeks and months, though.Different species of black widows can be found on nearly every continent.But it seldom bites unless threatened or protecting its eggs.

Morphine and barbiturates may be used to ease the increasing pain and convulsions.Though the venom's effect on breathing may make painkillers more dangerous.The only antivenom uses potentially harmful horse proteins, making it a last resort.The black widow's bite is rarely deadly for healthy adults.

Black widow spiders.

Although the common name «black widow spider» is most commonly used to refer to the three North American species best known for their dark coloration and red hourglass pattern, it is occasionally also applied to several other members of the Latrodectus (widow spider) genus in which there are 31 recognized species including the Australian red - back, brown widow spider (sometimes called the gray widow), and the red widow spider.

Adult female black widow spiders are shiny black with an hourglass shaped marking on the underside of its abdomen which, although most commonly red, may range in color from white to yellow to various shades of orange and red.

Currently, there are three recognized species of black widow found in North America: The southern black widow (L. mactans), the northern black widow (L. variolus), and the western black widow (L. hesperus).

DINING HABITS In a new book about cannibalism, a zoologist argues that female black widow spiders (Latrodectus mactans shown) don't deserve their bad rap.

Southern black widow spider (Latrodectus mactans) is with its prey house cricket (Acheta domesticus) trapped in spider web.

The evolutionary psychologist, however, might contend that it is better to be safe from a harmless grasshopper than to be sorry from a deadly black widow.

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«Insect DNA extracted, sequenced from black widow spider web: Insect DNA remained detectable on spider web for at least 88 days.»

The bright red markings on the back of a female black widow spider is a clear warning to people to stay away — the venom in her bite can be lethal.

Although the calculated mass for that pulsar, called J1614 - 2230, is lower than that of the black widow pulsar, the uncertainty in the measurement is smaller: + / - 0.04 solar masses vs 0.12 solar masses for the black widow pulsar.

Now Marten van Kerkwijk of the University of Toronto, Canada, and his colleagues estimate that the black widow pulsar B1957 +20 (depicted right) is 2.4 solar masses (arxiv.org/abs/1009.5427).

The result is an increase in ticks, brown recluse spiders and black widow spiders, all serious health hazards for both pets and humans, she added.

Jérôme Marie, the first author on the paper, elaborates on this sentiment, writing, «The spider is shy, which means not as aggressive as the black widow.

The black widow spider's telltale red hourglass - shaped mark appears brighter and more contrasting to birds than to insects, finds a new study.

The species that preferred to build its web furthest from the ground — thus visible to birds hunting from above or below — also happens to be the only North American black widow with red marks on its back in addition to its belly, they found.

Next they estimated how the specific red and black hues used by black widows appear to birds compared to how they might be seen by insects such as crickets, beetles and ants, which black widows catch in their sticky webs.

The researchers discovered that black widows» warning colors are more visible to birds than insects.

But how do black widows broadcast their built - in chemical weapons to birds, without blowing their cover with their insect prey?

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Although a house spider's bite is not as painful as the black widow's, Garb and her colleagues were surprised to find that its venom is seething with latrotoxins — 47 in all, they revealed on 16 February in BMC Genomics.

This toxin may have evolved in black widows because they are big enough to build webs capable of ensnaring small lizards and other prey with backbones, Garb suggests.

Even before the recent genome work, researchers had characterized some of the components of black widow venom, identifying two seemingly unique families of proteins: latrotoxins, which act on neurons; and latrodectins, whose role in venom remains unclear.

The notorious black widow spins two very different sorts of webs.

All differ from those known in black widow venom.

(Both are named for the black widow genus, Latrodectus.)

Western black widow males court females by stepping onto their webs and tapping out a rhythm with their legs.

He kept 13 black widows in separate boxes in his lab, and starved them for 2, 7 or 14 days.

The only black widow species that regularly eats its mates is the southern black widow, Latrodectus mactans — though the related Australian redback spider Latrodectus hasselti also does it, with the male somersaulting gently into the female's mouthparts, apparently on purpose.

Among western black widows, in fact, the females go to great lengths to reassure the males that post-coital slaughter is not on the cards.

Black widow spiders or praying mantises munching on their mates make sense somehow — they look a little monstrous to begin with — but did you know that some seahorses are cannibals?

His team have been conducting a long - term study of western black widows in Arizona's state capital, Phoenix.

Black widow spiders get their name from the females» supposed cannibalistic behaviour, but this has been exaggerated.

«Picky male black widow spiders prefer well - fed virgins.»

I tossed a grasshopperinto the web of a black widow spider, assuming the spider woulddispatch it quickly.

New UTSC research shows that male black widow spiders prefer their female mates to be well - fed virgins, revealing a rare example of mate preference by male spiders.

The study focused on Latrodectus Hesperus, a species of black widow native to western North America including parts of Canada.Theseblack widows are not generally cannibalistic but males are much smaller than females, meaning if a female is hungry her drive to feed will be greater than her drive to reproduce.

The unicorn beetle in the picture, along with a black widow spider, praying mantis, scorpion and carpenter ant, are animated robots designed by the creators of ET.

On her abdomen, round as a raindrop, Charlotte wore a scarlet hourglass - the mark of the black widow.

The black widow display, a tank filled artfully with broken bottles, includes a male, looking tiny, pale, and negligible beside his elegant female conspecific.

«For some reason I tend to gravitate to these really dangerous spiders like the black widow,» says Garb.

Could the black widow spider not have acquired its poison gene from an invading bacteriophage?

The scientists also use molecular biology tools to compare the genomes of spiders that have extremely noxious venoms, including the black widow and the brown recluse, to those of spiders with non-poisonous venoms, such as the house spider.

But after any unfortunate encounter with a black widow spider, our advice is: «This is unlikely to relieve the parts that Atkinson will not reach.»

Although Charlotte was living in celibacy, black widows, like many animals, can store sperm for a rainy day.

The most effective predators proved to be other spider species, like the false black widow (Steatoda grossa) and the American house spider (Achaearanea tepidariorum).