The tree in front of our living room window, a cotoneaster, attracted a noisy and ravenous flock of cedar waxwings last winter. Twenty or more birds flew in quickly and loudly, ate large amounts of the bright red berries, and within seconds disappeared. They did this for a number of days—no sight of them when they weren't in the tree—until the tree was emptied of its round red snacks. Then they were gone.
We haven't seen them yet this winter, and are wondering where they are.