Two recent genetic studies have shown that a significant number of species of bats in Europe accounted for probably another two species 'cryptic' or more (Ibañez et al . 2006; Mayer et al . 2007).
Miwili ya hivi karibuni masomo ya maumbile umeonyesha kwamba idadi kubwa ya aina ya popo katika Ulaya waliendelea kwa pengine aina nyingine mbili 'fumbo' au zaidi (Ibáñez et al. 2006; Mayer et al. 2007).