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These fast moving spiders run on top of non sticky sheet webs that have a funnel retreat at one end . But what is more important , you do n't learn anything about the features which make your specimen distinct . After the 1906 earthquake and fire , which destroyed most of the original collections of birds and mammals , the department was reborn with the resurrection of the new Academy of Sciences . Large prey receive more venom than smaller prey , and often an attacking snake considers it unnecessary to inject venom into a potential predator ( such as a human ) that it is trying to repel , rather than kill . But one group of snakes , those familiar elapids known as cobras , has evolved secondarily the ability to spit venom , as a defense , at the eyes of a perceived predator . In the dining room , in glass display cases , rest the skeletons of a dozen snakes , their bare ribs and vertebrae coiled in the forms they once held in life . The shell is oriented by having the mouth ( aperture ) at the bottom and the point ( apex ) at the top . The query parameters entered on the form are summarized in query language at the top of every result page . A - Birds are a principle predator of land snails .