Secrets of Nature

Woolfe and Smith were joined by Natural History Museum curator W. P. Pycraft, ornithologist Edgar Chance, bird photographer Walter Higham, naturalist Charles Head, fellow Charles Urban Trading Company alumni H. M. Lomas of A Trip through British North Borneo (1907), and Woolfe's old friend, ornithologist and natural history cinematography pioneer Oliver G. Pike, who had established himself before the war with In Birdland (1907) and St Kilda, its People and its Birds (1908).

Chance asked local children to watch nests around Pound Green Common so he could work out the ones the cuckoo was most likely to visit next and thus instruct Pike as to where to position his cameras to catch the best shots.

[4][5][6] A 1922 British 12-minute short black-and-white silent documentary film, directed and shot by Geoffrey Barkas, featuring the conflict between two colonies of wood ants joined by a piece of tiber laid across a moat at a zoological garden.

[8] A 1922 British 9-minute short black-and-white silent documentary film, directed by Edgar Chance, featuring the life cycles of the ailanthus silkmoth and the red admiral butterfly, which according to Adam Dodd of BFI Screenonline was made at the time rayon was emerging as a man-made alternative to natural silk and anthropomorphised the insects in terms of their behavioural resemblance to human activities.

[10] A 1922 British 12-minute short black-and-white silent documentary film, compiled by W. P. Pycraft and shot by Oliver G. Pike, featuring a mother barn owl nicknamed Strix.