The Last Migration is nonetheless an aching and poignant book, and one that’s pressing in its timeliness. It’s often devastating in its depictions of grief, especially the wider, harder to grasp grief of living in a world that has changed catastrophically, where governments and scientists are scrambling to ameliorate what harm they can – choosing, for example, which particular animals are the most important to try to save (pollinators, like insects and bats), and which to let disappear forever.