[From a quick search, this was neither currently possible nor already mentioned, but apologies if I missed something.]
I think it would be useful to be able to have the ability to add a setting to block observations of a particular taxa site-wide, or at least mask/hide the photos of that taxa (perhaps you could be able to click on the photo to reveal, but only after you know what you’re getting into). Potentially, I could also see the use case for blocking content with certain observation fields and/or tags.
I know it may seem silly/unnecessary, but phobias/intense fears of certain organisms are surprisingly common, and can cause intense and immediate fear and anxiety. Fear of animals is specifically covered in the DSM as a common manifestation of this anxiety disorder-- most often as fear of spiders or snakes. Studies vary on how many people are affected by animal phobias, but several studies seem to suggest around 5% of the population may be affected, with women having higher rates than men. I think adding this option would increase the site’s accessibility to people who may be affected by anxiety.
At first, I was going to create limit this request to the “Explore” page, but I feel that something site-wide would be more comprehensive-- potentially triggering material might come up on your homepage because someone you’re following may have posted it, or perhaps it may surface when looking at observations listed under a project, place, profile page; it could even surprise you on the log-in screen (don’t know how to avoid that one, though-- thoughts?). In “Explore”, although I know it is possible to add “&without_taxon_id=” to the url manually, this a) is very annoying to do every time if you’re just trying to browse your local area every now and again; b) requires you to know the taxon ID number, which I don’t think there’s any way of finding out without having to come face to face with the very thing you’re trying to avoid; and c) many users may not know about this since it isn’t well-integrated-- it does not seem to be one of the listed filter criteria, and I myself only found out about it by searching forum posts several times over. Honestly, the idea of observation search “filters” seems quite incomplete without being able to filter out something you don’t want to see!
[As a side note, I myself don’t have any true phobias of animals (that I know of!), and would honestly not have thought of the use case for blocking/hiding content until recently repeatedly coming across Braconid wasp larvae on hornworm caterpillars while browsing iNat. Photos of these parasites honestly make me feel physically ill and extremely uncomfortable. I am very fortunate in that a) it’s not strong enough of a reaction that it’s debilitating; and b) it’s relatively uncommon that these are posted, so it’s only rarely that it crops up. But it’s happened enough times that I would really love to be able to just browse in peace without feeling like I may get jolted if I’m not careful. It’s made me feel a lot more empathy for people who are deeply afraid of something more common, like spiders or snakes, which it would be very difficult to avoid on this site and may even deter many users from ever even considering joining.]