The species least likely to become extinct among them are those that only consume river snails.
A species is an organism's fundamental unit of taxonomic rank and categorization, as well as a unit of biodiversity. A species is frequently described as the biggest group of creatures capable of sexual reproduction, in which any two individuals of the right sexes or mating types can result in fertile offspring. The karyotype, DNA sequence, anatomy, behavior, and ecological niche are further methods of distinguishing species. Since it is impossible to investigate fossil reproduction, paleontologists also employ the chronospecies idea.
According to the most recent accurate estimate, there are between 8 and 8.7 million different species of eukaryotes. Only 14% of these, however, have been described by 2011.
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