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less compared with migratory(迁移的)animals such as birds. "It's an insight into how they build up their picture of space, adds Richard Holland,a biologist at Bangor University who studies bird navigation. There were already indications that dogs-like many ani- mals,and maybe even humans-can sense Earth's magnetic field.In 2013,Hynek Burda,a sensory ecologist at the Czech U- niversity of Life Sciences Prague who has worked on magnetic re ception for 3 decades,and his colleagues showed dogs tend to o- rient themselves north-south while excreting ()Because this behavior is involved in marking and recognizing field,Burda reasoned the line-up helps dogs figure out the location relative e to other spots.But fixed line-up isn't the same thing as navigation.