So, crows it seems, thanks everyone!
@astro_jcm Probably crows - I always find this helpful! https://rosemarymosco.com/comics/bird-and-moon/raven-vs-crow #corvids
@astro_jcm I always think of ravens as really big and these look more ordinary. So crows? Corvids anyway!
@astro_jcm I've only seen ravens in the woods, never in a peopled place like this park. But that may just be me.
@astro_jcm
I think crows
@astro_jcm you must bring them something shiny in order to sit on their bench
@toddthomas I'll remember that for next time 
@astro_jcm Oh yes they are. How to separate you from your goodies.
@grippingyarn They did seem very interested in the croissant I was eating... 
@astro_jcm up to something? I’d say so - the two at the end are a pair of crows. That one sidling in from the side would make it attempted murder.
@choobs I see what you did there...
@astro_jcm There's an old saying ' If you see a rook, it's a crow, if you see crows they're rooks"