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Lazarus species: 13 'extinct' animals found alive

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Cuban solenodon

This strange-looking creature is so rare that only 37 specimens have ever been caught. It was originally discovered in 1861, but no individuals were found from 1890 to 1974. Unusual among mammals in that its saliva is venomous, the Cuban solenodon was most recent sighted in 2003, an event so celebrated that the individual was given a name: Alejandrito.