Humanist organisations around the world seem to be getting more open to talking seriously about non-human sentient beings. Maybe that's not a surprise given humanists are already supposed to be committed to evidence, reason and compassion - willing to break from harmful social norms to find a more compassionate morality. They also seem, anecdotally, more likely to be vegan than the general population - although that's a low bar to beat.
Here are three examples you might find interesting - maybe the anthropocentrism of humanism is starting to crack...?:
Let me know if you've seen further examples. Feedback on the articles above is always welcome too, of course.