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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 to
other spots.But fixed line-up isn't the same thing as navigation.
In the new study,Burda's graduate student,Katerina
Benediktova,initially put video cameras and GPS trackers on
four dogs and took them on trips into the forest.The dogs would
