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Spiders, facts and information

Juveniles of some spiders in the families Anyphaenidae, Corinnidae, Clubionidae, Thomisidae and Salticidae feed on plant nectar. Laboratory studies show that they do so deliberately and over extended periods, and periodically clean themselves while feeding. These spiders also prefer sugar solutions to plain water, which indicates that they are seeking nutrients. Since many spiders are nocturnal, the extent of nectar consumption by spiders may have been underestimated. Nectar contains amino acids, lipids, vitamins and minerals in addition to sugars, and studies have shown that other spider species live longer when nectar is available.

A minority of species are social, building communal webs that may house anywhere from a few to 50,000 individuals. Social behavior ranges from precarious toleration, as in the widow spiders, to co-operative hunting and food-sharing. Although most spiders live for at most two years, tarantulas and other mygalomorph spiders can live up to 25 years in captivity. Other ambush predators do without such aids, including many crab spiders, and a few species that prey on bees, which see ultraviolet, can adjust their ultraviolet reflectance to match the flowers in which they are lurking. Wolf spiders, jumping spiders, fishing spiders and some crab spiders capture prey by chasing it, and rely mainly on vision to locate prey. Spiders have primarily four pairs of eyes on the top-front area of the cephalothorax, arranged in patterns that vary from one family to another.

Many spiders inject venom into their prey to kill it quickly, whereas others first use silk wrappings to immobilize their victims. Spiders often attach highly visible silk bands, called decorations or stabilimenta, to their webs. Field research suggests that webs with more decorative bands captured more prey per hour.

In some cultures, spiders have symbolized patience due to their hunting technique of setting webs and waiting for prey, as well as mischief and malice due to their venomous bites. The Italian tarantella is a dance to rid the young woman of the lustful effects of a spider bite. Web-spinning also caused the association of the spider with creation myths, as they seem to have the ability to produce their own worlds. They placed emphasis on animals and often depicted spiders in their art. The only living members of the primitive Mesothelae are the family Liphistiidae, found only in Southeast Asia, China, and Japan.

The heart is a tube in the upper part of the body, with a few ostia that act as non-return valves allowing blood to enter the heart from the hemocoel but prevent it from leaving before it reaches the front end. The blood of many spiders that have book lungs contains the respiratory pigment hemocyanin to make oxygen transport more efficient. Build a sequence of cards in the piles by moving any face up card on top of a card with the next-highest value, such as a 9 of spades moving onto a 10 of spades. For most people, the thought of spiders conjures up images of tarantulas, wolf spiders, and other fearsome creatures. Though all spiders have venom to one degree or another, only a handful are dangerous to humans.

While the current version of Spider oringinates from 1949, the first mention of Spider comes Games Digest published in 1937. They describe the game we know today as Spider, slightly differing in having a 50-card initial tableau instead of 54. However, they talk about it as a well-known game, so it's likely Spider has its orgins from the early 1930's at least. The Foundations are the four piles on which a whole suit or sequence must be built up. In most Solitaire games, the four aces are the bottom card or base of the foundations. They are distinguished by having fangs that oppose each other and cross in a pinching action, in contrast to the Mygalomorphae, which have fangs that are nearly parallel in alignment.

The principal eyes are also the only ones with eye muscles, allowing them to move the retina. Despite the relatively small central nervous system, some Spiders exhibit complex behaviour, including the ability to use a trial-and-error approach. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'spider.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Ananse is a trickster spider who uses his quick wit and antics to outsmart other animals. Other items with limited availability will pop up as well, like live spider crabs from Maine. Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.

Some pump digestive enzymes from the midgut into the prey and then suck the liquified tissues of the prey into the gut, eventually leaving behind the empty husk of the prey. Spiders have developed several different respiratory anatomies, based on book lungs, a tracheal system, or both. Mygalomorph and Mesothelae spiders have two pairs of book lungs filled with haemolymph, where openings on the ventral surface of the abdomen allow air to enter and diffuse oxygen. The tracheal system has most likely evolved in small ancestors to help resist desiccation. Spiders that have tracheae generally have higher metabolic rates and better water conservation.

However, a few species with powerful venom, large jaws or irritant bristles have patches of warning colors, and some actively display these colors when threatened. Female spiders' reproductive tracts are arranged in one of two ways. The ancestral arrangement ("haplogyne" or "non-entelegyne") consists of a single genital opening, leading to two seminal receptacles in which females store sperm.