Drones in Vancouver?

Im assuming they were large drones.  You could hear the closest one.  They would fly so far then circle back around.  It kept doing that as it kept moving forward...like they were monitoring or mapping.  The other next closest one was doing the same.  They all had the same lights on them as you would expect on a small aircraft. You could see the others in the distance spread out from each other.
One response to my daughters post said they were star link satellites, but these were not those.  These were much lower and you could hear the whirring sound of the propellers from the one that was closest.
Tried to find out any info or postings on it...but nothing. Just curious who’s drones they are and what the purpose was deploying them at that time of night. Not sure when they started. I just noticed them when I went outside around 11:15/11:30 last night.