[4] In 2017, Stevens and Dr Sarah Paul led a study commissioned by British Horseracing Authority in collaboration with the Royal Society for the Prevention of Cruelty to Animals.
The study hence concluded that the original orange should be substituted by either white, fluorescent yellow or light blue in order to improve animal welfare and safety.
As his studies on colours increasingly moved towards marine animals, Stevens, who had a longstanding hobby of wildlife photography, started to work with and develop the underwater techniques.
Thus, he began to give more attention to the underwater lighting and scenery where he frames his objects, to create better image compositions,[12] "I’ve really worked on making my photographs aesthetically pleasing", he has mentioned.
[16] He has also noted that his frequent photographing spots are the beaches like Gyllyngvase, around Falmouth, Cornwall, where he is based,[13] with the further West locations of Helford estuary and Kynance Cove being among his preferred ones.
[21] In the same year, Stevens also released Secret Worlds: The Extraordinary Senses of Animals, an easy-reading version of his 2013 textbook, Sensory Ecology, Behaviour, and Evolution.
An interesting fact described concerns the nocturnal ogre-faced spider, from Australia, which has such large and sensitive eyes that it must break down its photoreceptors and membranes during the day and then regenerate them to hunt at night.