Add Yahoo as a preferred source to see more of our stories on Google. A joint report alleging that a poison dart frog toxin has been linked to the death of Russian opposition leader Alexei Navalny ...

A joint report alleging that a poison dart frog toxin has been linked to the death of Russian opposition leader Alexei Navalny rippled quickly around the globe among scientists. The allegations raised ...

A poison found in threatened frog species in the Ecuadorian foothills has been named as the cause of Alexei Navalny's death in prison. Scientists from Germany, France, the Netherlands, Sweden and the ...