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fileunderwater's answer is probably the most accurate. I just wanted to add that, depending on your needs wikipedia > lists of extinct species can be a decent source of information.
You can search for species that are "Extinct" or "Extinct in the wild" at the IUCN red list website (International Union for Conservation of Nature and Natural Resources). That list currently includes 903 species, but some of the assessments might be obsolete (see annotations). From that list, you can click and get some basic information about each species. ...
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