iNaturalist
From Geohashing
iNaturalist is a social network in which people can upload photos of plants, animals and other lifeforms. Other members will then identify which species it belongs to. Several Geohashers use iNaturalist in order to identify species they have encountered on their expeditions. If you are on iNaturalist, join the Geohashing project there and tag observations made during Geohashing expeditions with #geohashing!