Today I talk to America's leading undercover investigator Pete Paxton, who has spent the past couple of decades exposing what happens to animals in a huge range of animal exploitation facilities - including farms, fishing vessels and in more than 700 puppy mills. His work has been featured in both HBO and National Geographic documentaries, and he has not only raised a huge amount of mass awareness to what happens to animals, but his work has been instrumental in holding owners and workers in these industries accountable, taking them to court and securing prosecutions. We talk in depth about some of his experiences, and also what lessons he has learnt from his time as an undercover investigator.