I generally upload 2 types of photos:
1. My own highly amateur photo snapshots of plants and other interesting things. If I found the plant in the wild (here in Southern California), I attempted to identify it myself. If I misidentifed any of these, please fix it or let me know. If I took the picture in a botanical garden or a zoo I noted the name on the identification tag - I assume these are correct, but occasionally they are not.
2. Photos that other people took. These were posted on Flickr under appropriate license, or on a US government site with no copyright indicated. Some photos on government sites are copyrighted; these should not be uploaded.
My personal photos are in the public domain.