I love the Wall of Birds. The ones that don't occur where I live or have lived are especially intriguing for their novelty. Of the ones that occur near me, my favourites are the Common Loon and the Great Blue Heron. I see the Great Blue Heron more frequently, but the Common Loon is especially exciting to find, other than on our Canadian dollar coin, which we call a "loonie" because it has a loon engraved on its surface. I love the sound of a loon!
In marshy areas near me I can easily identify the red-winged blackbirds by sound, often alerting me to the exact location. A couple of the marshes also have yellow-headed blackbirds. The bright yellow head and call that only a mother could love helps identify them.