Our provincial bird is truly colourful, but has some other less attractive features. Especially if there are platform (flat feeders) with lots of sunflower seeds, jays can show up in the dozens and go through a lot of food. There is genuine concern that since blue jays are notorious nest robbers and steal both eggs and young, encouraging excessively high numbers might be detrimental to other bird species. Limiting the amount of food you put out on platform feeders seems to keep down their numbers. Another solution would be some kind of open fencing around a flat feeder, allowing small birds in while keep out the larger jays.
Macphail Woods Ecological Forestry Project
C/O Voluntary Resource Council
81 Prince St.