Bird's nest... Yesterday evening I found this nest sitting on the lawn underneath one of our pine trees in the front yard. It's a beautiful example of mud-and-grass construction, with a shell that's quite thin, yet strong. The grass provides tensile strength, the hardened mud compressive strength – the same principle as rebar in concrete. There are two “holes” in the bottom of the nest that are where it sat on branches, incorporating them into its structure. Completely absent are any materials to make the inside softer, as one would usually find. I see no signs that this beautifully made nest was actually ever used. It likely represents a male's failed attempt to woo a female...
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