I didn’t
expect this feeling of loss that hit me when I realized the bluebird nesting
season was nearing the end. After a
summer of monitoring five nesting boxes in a state park, there is only one
active nest left. I remember the emotions I felt when my kids left
for college eons ago, so it seems a bit ridiculous to feel empty nest syndrome now…over
a bunch of birds no less.
Last spring
two friends and I committed to spending the summer monitoring bluebird boxes. We recorded our findings and compiled a notebook
detailing nest activity for each box. The
North American Bluebird Society and Cornell Laboratory of Ornithology track monitoring
efforts and bluebird population data. Back
in the 1970s, the bluebird population reached a 70 percent decline, mostly due
to habitat loss and competition for nesting cavities from non native species
such as house sparrows and starlings. Today,
bluebird boxes, trails and monitoring efforts have contributed to
reestablishing the bluebird population.
Beginning in
the spring, the birds have two to four broods a season. The female lays four to six blue eggs. She lays one a day and when the last egg is laid,
she then begins to incubate them. Eggs
hatch about 17 days after the first one is laid. Nestlings occupy the nest from 17 to 21 days
before fledging. We
removed old nests each time a brood fledged. No matter how many babies we saw this summer, we reacted with awe every single time we opened a box and saw babies.
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We used a mirror to look down inside the box. One friend, a film student, recorded findings for a documentaty project. |
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Bluebirds lay beautiful blue eggs. |
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Brand new nestlings. |
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New babies are all mouth! |
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Older babies fill up the nest. Blue feathers are evident just before fledging. |