Bluebird and Small Cavity Nester Conservation
Sialis - Bluebirds and other small cavity nesters


Nest, Eggs and Young

Cavity nester photos of nests eggs and young

Cavity Nester Nests, Eggs and Young Photos and Bios. Also see Nest ID Matrix (contents) and Egg ID Matrix (color, spots, etc.)

HOWR Dummy Nest. Photo by E.A. Zimmerman.

A typical House Wren dummy nest, found in a slot box. Notice the loose arrangement of sticks, it does not fill the box, no nest cup, and no spider cocoons.

Dummy nests are placed in a variety of nestboxes by the male House Wren. The female chooses the box and them reconstructs a nest.

See more information on House Wren Biology, and tips on Deterring House Wrens if you prefer not to let them use boxes on your trail.


    The student of Nature wonders the more and is astonished the less, the more conversant he becomes with her operations; but of all the perennial miracles she offers to his inspection, perhaps the most worthy of admiration is the development of a plant or of an animal from its embryo.
    -Thomas Henry Huxley, British biologist and educator. Reflection #54, Aphorisms and Reflections, selected by Henrietta A. Huxley, Macmillan, 1907.

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May all your blues be birds!

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Last updated March 24, 2016. Design by Chimalis.