Canada Jay's (formerly called Gray Jay) are the delight of northern coniferous forests. These birds are intelligent, curious and often follow me through the woods making their quiet and highly-varied chirps, squeaks and whistles. They are cold-adapted and need colder climates. For example, they use their sticky saliva to cache food by gluing it to trees where they can find it for later. If temperature's get too warm, the saliva-glue thaws and breaks down and the food falls to the ground or spoils.