The employment of animatronics makes it possible to document interactive behaviour no animal would have shown towards a human filmmaker or in front of a hidden camera.
The first series ran for five episodes from 12 January 2017 and concluded on 3 February 2017, and aired on BBC One.
The series focuses on the complex emotions and ethology of animals, using more than 30 specially built animatronic "spy creatures", often shaped like the offsprings of the species.
Spy creatures included: From penguin chicks to elephant seals and wolf cubs to polar bears, the spy creatures meet and observe the hardiest and most charismatic animals in the Arctic and Antarctic circles.
Tim Goodman of The Hollywood Reporter called the miniseries, "Pretty incredible.