Please note that the content of this book primarily consists of
articles available from Wikipedia or other free sources online.
Critically Endangered is the highest risk category assigned by the
IUCN Red List for wild species. Critically Endangered means that a
species' numbers have decreased, or will decrease, by 80% within
three generations. As the IUCN does not consider a species extinct
until extensive, targeted surveys have been conducted, species
which are possibly extinct are still listed as 'Critically
Endangered.' A new ideal category for 'Possibly Extinct' has been
suggested by BirdLife International to categorize these taxa.
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