“Searle looked at two other locations much further to the south: the Azores and
Madeira — and in both places they found mice there carried the same genetic
signature as that carried by the Viking mouse. Crucially, they found very few
mice that carried genetic signatures like those found in mouse populations in
Portugal, whose mariners were also reckoned to be the first to settle on these
islands.”
“The Norse may have been at the site slightly earlier, but they were definitely
there and cutting down trees by 1021. Based on the development stages of
certain cells in the waney layer, Dee, Kuitems, and their colleagues say that
one of the trees was cut down in the spring, while another was cut down in the
summer or fall.”