University of Saskatchewan researchers have discovered three new species of poisonous dart frogs living deep in the Columbian jungle. And there is some urgency to discoveries like this. The researchers say these frogs appear to be already at risk of extinction. Biology Professor José Andrés says, “Some species may disappear even before we have the chance to study them.” The frogs produce poison because of the toxic bugs they eat. They are harmful to humans only if the poison enters the bloodstream. Their bright colours and the ,”dangerous,” appeal of their toxicity makes them attractive to the international black market where they are often sold for more than $2,000. Columbia is home to 17 per cent of the known frog species in the world. The results of their work have just been published in the journal, “Molecular Ecology.”