Watch Online Free on Watchseries. 'Secrets of Nature' was a series of short films produced by the BBC in the 20s and 30s about animals, plants and our relationship to them. In 2021, and in tandem with the 'Cinema e Razão Ecológica' conference, Teresa Castro gives it a new reading in four episodes in which she explores the world of lichens, mushrooms and ruderal plants. An unprecedented mini-video series, produced by Culturgest.