But it would be that, not a human observation. It is the human observation explanation that gave me pause. It, like material citation, references field notes. To me it would mean things like lists of species where one relies on someone’s id of something - which may be correct but for which there is no other evidence than someone reported the species to be there then. Yes, the list is written down somewhere, but there is no other evidence for the occurrence than the list (or recording of someone talking or notes made from “an elder”).