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Conservation priorities and legal protections are often based on confirmed species occurrences. However, imperfect detection is likely the norm in biological surveys, resulting in negative consequences for conservation. Focusing on threatened species in the US and Canada, we show that detectability information appears to be lacking for most species that are conservation priorities. Although more research on species detection is needed, detectability estimates are important for many immediate decisions. Thus, we recommend: (1) estimating and accounting for detectability and designing rigorous surveys when confirming presence or absence is crucial. Otherwise, absence in surveys should be considered suggestive only and critical habitat should be managed even if species presences are unconfirmed. (2) When directly estimating detectability is prohibitively difficult, indirect estimates should be explored, for example through expert elicitation or trait‐based predictors. (3) Detectability should be explicitly incorporated into decisions to ensure that surveys and management actions are directed where they have the greatest potential benefit. [ABSTRACT FROM AUTHOR]

Finding ways of efficiently monitoring threatened species can be critical to effective conservation. The global proliferation of community science (also called citizen science) programs, like iNaturalist, presents a potential alternative or complement to conventional threatened species monitoring. Using a case study of ~700,000 observations of >10,000 IUCN Red List Threatened species within iNaturalist observations, we illustrate the potential risks and rewards of using community science to monitor threatened species. Poor data quality and risks of sending untrained volunteers to sample species that are sensitive to disturbance or harvesting are key barriers to overcome. Yet community science can expand the breadth of monitoring at little extra cost, while indirectly benefiting conservation through outreach and education. We conclude with a list of actionable recommendations to further mitigate the risks and capitalize on the rewards of community science as a threatened species monitoring tool. [ABSTRACT FROM AUTHOR]