Typical Bluebird Nest Description: Neat, cup shaped, woven nest typically 100% fine grass or pine needles. Cup may be in the back of the box. Occasionally bits of fur or a few feathers, or even some hair (e.g., from a horse). Fairly deep, often cylindrical nest cup - usually 3-4" deep, with the cup portion 2.5" in diameter and about 2.25" deep.
The nest on the left is in a Peterson box. It is messier than what I usually see. The nest below is in a small NABS box, and contains a lot of White Pine (Pinus strobus) needles.
Notice the cup is deep, and more neatly woven than the rest of the nest.
Usually bluebird nests do not have seedheads (more typical of House Sparrow nests) but this is for a second brood and may have been built in a hurry.
The photo below shows the shape of the cup. Photo by Jeff Kellogg.
In a taller nest (e.g., in a box that has not been cleaned out) Keith Kridler found that bluebirds may be more likely to build the nest cup towards the back of the box, furthest from the entrance hole.
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