This fall we have had a flock of Clarks Nutcrackers and several Stellar Blue Jays co-habitating in our canyon. At one point we had over 50 Nutcrackers, but the majority of them moved on and about a dozen have stayed and the Jays are staying too. In the four years that we have been here (Salmon Idaho) we have not had Nutcrackers in our canyon so this is very interesting.
There are differences and similarities between the two species. Physically they are similar in size. Socially the Jay is much more aggressive, but the Nutcrackers are very verbal if you invade their space. The Jays seem to be solitary where the Nutcrackers are in a large group, but are paired up. They are both feeding on the Douglas Fir pine cones but the Jays are always looking for a handout at the feeders.
A very interesting note; this past spring we planted fifty White Pine seedlings, along with Ponderosa, Lodgepole and Western Cedars. We did this to bring diversity to our DF woodlots but also to attract Nutcrackers (their main source of food is WP seeds). The seedlings are not producing seeds yet and will not for quite some time, but whenever I tend to the WP seedlings the NC's put up quite a ruckus.
Is it possible they were drawn to the canyon by the presence of the seedlings?