Most of life on Earth is invisible to its human inhabitants. This includes the estimated one trillion microbial species that are too small to be resolved by the human visual system (Klotz, 2010;Locey & Lennon, 2016;Mora et al., 2011), the further thousands of macroscopic species that inhabit concealed habitats such as subterranean or underwater (Appeltans et al., 2012;Giller, 1996), and then the perfectly visible species that are simply overlooked, as described by