In filming for the BBCs mating game, the film-makers for the BBC were forced to work in a different way to normal.
Given rules that were put in place to stop the epidemics spread, it was impossible in many instances to send film makers on trips all over the world. As a result, they were forced to rely on local wildlife film-makers.
The producers of the series, found that not only did this make it easier to get the footage required, but also meant that it was easier to know timings of when specific parts of the series would be complete.
Over the last couple of decades high definition cameras have become the norm and in recent years, local people around the world have been trained to use them. With the advance of 4G signal in wilder parts of the world, it is now possible to stay in touch with crews even when they are in the field. This also means that the carbon price of the production can fall dramatically.