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Terms: invertebrates
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  1. Bees - Males Have Half the Chromosomes (
      "Bees, wasps, and ants from the group of insects known as the hymenopteran order and other invertebrates have males with only half the usual complement of chromosomes. These insects and invertebrates comprise 20 percent of all animals." 10-04

  2. Shrews (IPM of Alaska)
      "Shrews eat insects, spiders, slugs, and other small invertebrates. Some species are dependent upon plant matter, but most will eat any kind of meat. Shrews are cannibalistic and will readily kill and eat each other, or feed upon ones caught in traps or other enclosed areas. In western Interior Alaska, shrews will feed on blackfish that have come to the surface at holes in frozen-over lakes." 4-05

  3. Extinction Level Event (
      "An extinction event (also extinction-level event, ELE) occurs when a large number of species die out in a relatively short period of time. Based on the fossil record, the background rate of extinctions on Earth is about two to five taxonomic families of marine invertebrates and vertebrates every million years."

      "The classical 'Big Five' mass extinctions identified by Raup and Sepkoski (1982) are widely agreed upon as some of the most significant: End Ordovician, Late Devonian, End Permian, End Triassic, and End Cretaceous." 03-06

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