In order to protect biodiversity we have to understand it. Ontario’s Biodiversity Strategy includes commitments to report on the State of Ontario’s Biodiversity and on progress in achieving Ontario’s 15 Biodiversity Targets every 5 years. The State of Ontario’s Biodiversity website includes indicators that summarize data from monitoring programs to evaluate progress in achieving each of the 15 Targets and status and trends in three biodiversity theme areas: pressures on biodiversity; state of ecosystem, species and genetic diversity; and, conservation and sustainable use.