I am a member of iNaturalist. Sponsored in part by National Geographic and the California Academy of Sciences, the website collects images of nature taken by photographers around the world. Each is graded by curators according to their value to researchers. The site is free and open to anyone who loves nature and has a camera (or smartphone).
According to their website, “Every observation can contribute to biodiversity science, from the rarest butterfly to the most common backyard weed. We share your findings with scientific data repositories like the Global Biodiversity Information Facility to help scientists find and use your data. All you have to do is observe.”