Loss looks at the devastating effect introduced mammals have had on New Zealand's unique wildlife.

Watch the video version of the episode here.

Dealing with Loss takes listeners back to Gondwana, to explore just why our native birds are so tragically vulnerable to predation by mammals from another hemisphere.

Host Dave Hansford then presents a series of "criminal profiles" introducing listeners to the Predator Free target species: the brushtail possum, the stoat, the kiore, and the ship and Norway rats, through accounts from the country's leading experts.

The podcast then quantifies the loss - one of the worst extinction episodes on the planet - before relating the peril that continues today, with commentary from field experts on the impacts of this suite of predators.

Go to this episode on rnz.co.nz for more details