Hi @HelenCross, sorry for not answering sooner. I can’t see any signs of down on them, so if they are young they would be well on the road to independence. I’d say more likely than not that they’re adults (I’m not familiar enough will the calls to factor that in unfortunately).
Thanks @Liam.m I'm hoping they might hang around to get some more shots. They stayed in this same spot for the 10 minutes I was there and after I had to leave. They appeared to be looking around and calling, perhaps for parents, but possibly as contact calls with each other, or territorial calls?