I'm not sure if they have alt text on their images though? Guessing not because of the GitHub link to suggest it? I'm sorry if that's so. I use masto in my mobile browser to save on app space and since I moved instances I can't see which pics have alt text or not, or at least I haven't found a way to tell. 

 @b5820e93 The last image had limited alt text - it just said 'seminole bat'. 

 @205529d2 Thanks - not much to go on! 🙄