Photography. I like birds, amphibians, and insects. I upload with location data to iNaturalist, which crowd-sources biodiversity. To that end, I will go to several different sites in my area at different times of the year so that I can contribute a variety of species at a variety of locations.
If you're well-versed in identification, you can confirm species identification on the app too. I'm familiar with the calls of all the frogs in my area and will help identify frogs in recordings.