Due to the high species diversity, bats are a model for the study of choice for research on speciation. The difficulty of studying speciation lies firstly in the difficulty of defining a species: « A fly in a wine glass ». No consensus exists, a possible definition is "a group of individuals sharing a common gene pool, isolated from other groups".
Kutokana na utofauti high aina, popo ni mfano wa kuigwa kwa ajili ya utafiti wa uchaguzi kwa ajili ya utafiti juu ya speciation . ugumu wa kusoma speciation uongo kwanza katika ugumu wa kufafanua aina: «Kuruka katika kioo mvinyo» . Hakuna makubaliano ipo, ufafanuzi inawezekana ni "kundi la watu kubadilishana kawaida gene pool, pekee kutoka makundi mengine" .