A taxon is Extinct when there is no reasonable doubt that the last individual has died. A taxon is presumed Extinct when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the taxon's life cycle and life form.
Whether you didn't look anything up, aren't too bothered about this test or are just plain bad at guessing, your endangered species knowledge is pretty extinct! I take some solace in the fact that you stuck with the test until the end and (hopefully) learned some cool facts.
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