After today's server maintenance (odd to be on a Thursday) I was flying through looking to replace what I had with rares. With Pettracker loaded, almost every single spot marked for a snowy owl (the few that didn't were in commonly traversed areas) had one. After going through the whole map I found 5 rares total, replaced 1 I needed, the other 4 were repeats of what I already had in blue.
Is this behavior normal after a server restart? Or have they made their spawns more common?