The stunningly beautiful evening grosbeaks are mystery birds that come pouring from the canyons to invade our urban areas on a daily cycle- an eruptive population here in Cache Valley. I always hear their loud chirp notes high above, often beyond sight. They alight in towering trees where they feed and converse with chirps and trills all the while. Highly social, evening grosbeaks are unlike their four solitary grosbeak cousins.