the twigs growing out of the interstice obviously make good support for a nest, and being inside the clump of bamboo is surely also good protection for the bird and her chicks (who were no longer there when WW cut the bamboo, in case you were wondering).
What's interesting, though sad also in a way, is that the bird used bits of plastic as part of the nest. I suppose it's useful - strong, pliable and waterproof.
Plastic is a really useful material, but I only wish it was used more wisely... instead of, for example, chucking it into the ocean:
"The largest of these garbage swills is known as the Pacific Gyre, or The Great Garbage Patch.
It is roughly the size of Texas, containing approximately 3.5 million tons of trash. Shoes, toys, bags, pacifiers, wrappers, toothbrushes, and bottles too numerous to count are only part of what can be found in this accidental dump floating midway between Hawaii and San Francisco." (The Great Garbage Patch)
Here's someone who decided to make a boat out of plastic bottles to bring awareness to this ridiculous waste of resources
Recycle, reuse, reduce! You know it makes sense!
[Edit 20/10/2009: "Message from the Gyre" - a powerful messge, not for the squeamish!]