Island mice
In August 1930, the last remaining villagers on St Kilda departed the islands for good. The resident house mouse became extinct almost immediately, having lived solely among the islanders and subsisting on their leftovers. The St Kilda field mouse, however, being hardier and almost twice the size of its counterpart in mainland Britain, still survives today. Research has found that the mouse is largely dependant upon seabird-derived food, though it is unclear if this is from scavenging or predation of seabirds, or from consuming their discarded food catches.