One of the key questions in evolutionary biology concerns how climate change affects organisms, from speciation, to population turnover and gene flow. By understanding how species have responded to climate change in the past, we may be able to infer how they will respond to ongoing climate change. Following on from my PhD projects, I aim to focus on understanding the evolutionary history of small Arctic rodents further back in time. Furthermore I will be investigating the impacts of Arctic recolonisation in muskox. I will be using complete mitochondrial and nuclear genomes from samples of collared lemmings and muskox.