Tenth- or eleventh-century fragments of mouse bone found in Madeira, along with mitochondrial DNA of Madeiran mice, may indicate that the Vikings have come to Madeira (bringing mice with them), prior to colonisation by Portugal.
Tenth- or eleventh-century mouse bone remnants and mitochondrial DNA from Madeiran mice found in Madeira could suggest that Vikings had come to the island (bringing mice) prior to Portugal's colonization.