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and their tiny bodies lose heat and burn energy quickly. for marine mammals like seals, bulky bodies packed with oxygen storing muscle and insulated by layers of fat help them spend many minutes underwater. the researchers used dna to work out exactly how such a diminutive mammal evolved this unusual semi aquatic lifestyle. the scientists created a genetic family tree of 71 related insect eating mammal species, and they discovered that at five distinct points in their history, shrews and moles had evolved the ability to store much more oxygen in their muscles in a protein called myoglobin. we can actually use the genetic, the sequences to tell us about the lifestyle. it s just a sequence of one protein that we are just using that is really incredibly important for this lifestyle, that actually tells us something that we couldn t figure out having all these fossils. so now having this incredible set of genes from all these different

Fat helpOxygen storing muscleInsect eating mammal speciesFamily tree