I suspect that the recent crop of Attenborough series have been very expensive to make. I am basing my guess on the length of time the camera people etc spend on location waiting for a specific event. Often these events are ones that most of us will never see.
I think someone got out of the wrong side of the bed
Bereavement wipes out everything
A drop in the ocean in the great schemes of things....but replicated by how many more
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