Wildlife producer John Downer demonstrates how he and his team went about making a documentary about penguins. In order to get close to them he deployed 50 special cameras disguised as rocks, eggs and penguins. Penguins - Spy in the Huddle can be seen on Monday on BBC One at 2100GMT in the UK.
![Is it a bird... No, it's penguin-cam](https://cdn-ak-scissors.b.st-hatena.com/image/square/aafbc9af3cc4ea8a408289dca0eadb56e3a0aee9/height=288;version=1;width=512/https%3A%2F%2Fichef.bbci.co.uk%2Fnews%2F1024%2Fmedia%2Fimages%2F65794000%2Fjpg%2F_65794011_penguincam.jpg)