Marlo the labrador is learning how to sniff out Covid-19 in the UK. In Tanzania, Thor is on the track of wildlife poachers. We see how their extraordinary noses are put to work. Show more
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Marlo the labrador is learning how to sniff out Covid-19 in the UK. In Tanzania, Thor is on the track of wildlife poachers. We see how their extraordinary noses are put to work. Show more