Why do some people who love nature end up destroying it? That’s the question documentarian Timothy Wheeler explores in his new award-winning film, Poached, which investigates the strange British subculture of illegal egg-collecting. While collecting eggs is necessary for some forms of scientific study, that’s not the motivation behind the fanatics Wheeler exposes in his film. Instead, these individuals enthusiastically roam huge swathes of Britain’s countryside to find eggs, often scaling gigantic trees or abseiling down perilous cliffs to raid nests. The precious tokens are then pierced and the contents blown out to leave the exquisite, collectible casings behind. The resulting collections could tangibly hurt populations: Individuals have been known to amass hoards of several thousand eggs, posing such a danger to species that in Britain, collectors are prosecuted with prison sentences and fines of up to £5,000 ($7,400). Wheeler worked with the U.K.’s Royal Society for...