what a good reminder for us to help our bird friends in this way. I use coir (inexpensive in my area which is filled to bursting with coconuts) as mulch, especially in container plants and the birds love to snitch this, including the hummers) and carry some off for nesting. They are not always particularly tidy about it but i don't care. Big birds, little birds, who knows what else, but it makes me really happy to know that the garden is supporting the birds in this way.