We have not seen a BlueJay in our area in several years. I don't even remember the last time. Yesterday and today there a large number of them. They flew between the big oaks and in the woods. One...
Where we live Blue-jays don't migrate. However this is a year of change for many migratory and non-migratory species. Many, but not all, will change their patterns during this El Nino year. If your area is expected to be warmer than normal some migratory species may not leave and vice-versa. This is not an absolute but a strongly, evidence based, documented theory from the Cornell School of Ornithology.