Estanque Deermouse (Peromyscus guardia ssp.)

The Estanque Deermouse was endemic to the Isla Estanque, a tiny, only 0,83 km² large islet south to Isla Ángel de la Guarda in the Gulf of California, Baja California, Mexico. However, this particular population apparently was never officially described and may in fact have been identical to the nominate subspecies inhabiting Isla Ángel de la Guarda. 

Anyway, whether endemic or not, the deermice of Isla Estanque are gone now, the whole population appears to have been wiped out within a single year (1998 to 1999) by a single feral cat! [1]

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References:

[1] Ella Vázquez-Domínguez; Gerardo Ceballos; Juan Cruzado: Extirpation of an insular subspecies by a single introduced cat: the case of the endemic deer mouse Peromyscus guardia on Estanque Island, Mexico. Oryx 38(3): 347-350. 2004

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edited: 23.01.2020