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Chestnut-sided Warbler Sitting On Eggs

Different species of birds have different numbers of broods (sets of eggs/young).  Eastern Bluebirds can have up to four broods per breeding season, American Robins up to three and Eastern Phoebes often two.  Chestnut-sided Warblers typically only raise one family in a summer. If weather or predation destroys their first attempt, however, they will re-nest, which is just what the pictured female Chestnut-sided Warbler is doing.

By August, a majority of birds have raised their young, but there are birds that nest late in the season, some naturally (American Goldfinches) and some, such as this Chestnut-sided Warbler, by necessity.  Where birds nest, geographically, affects the number of broods they have. Birds nesting at higher latitudes tend to produce fewer broods per year.  Because it gets colder earlier than further south, there is less time to raise their young.  In warmer regions, birds often raise two or even three broods per year. (Thanks to Dean and Susan Greenberg for photo op.)

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8 responses

  1. Mus

    Question for you, if this is possible from this email:

    The nest holding 5 fairly fledged chimney swift babies gave way and they all ended up in my fireplace! I took them to the Vermont Institute of Natural Science (VINS) and they are doing well. Question: at this late date will the parents retry? I did hear some fluttering up there early last evening… Janet Watton Randolph Center VT >

    August 1, 2019 at 8:08 am

    • Mus, I don’t know if it’s too late for chimney swifts to start a second brood. They do have 1 – 2 broods, so it’s possible. Just don’t know if it’s too late or not.

      August 1, 2019 at 8:44 pm

  2. Mary – the chestnut-sided warbler is one of my favorite warblers!! What a find! Love your insight & info as usual! You always teach me something!

    August 1, 2019 at 8:15 am

  3. Alice

    What an interesting nest, how it’s been built in between the branches. Clever birds!

    August 1, 2019 at 9:41 am

  4. Linda G.

    One of my favorite birds as well! Do you have any idea of how many young they had the first nesting? Exciting to think they may successfully raise two families!

    August 1, 2019 at 12:00 pm

    • Three to five young is typical, Linda. Only two in this second brood, though.

      August 1, 2019 at 8:41 pm

  5. William Loomis

    Sent from Mail for Windows 10

    Hi Mary,

    I e-mailed you recently about monarch caterpillars asking some question( see below). This time I’m sending some photos. The first shows a chrysalis found about 25 feet away from the milkweeds. The second shows three caterpillars on a milkweed. The third shows the remains of a milkweed stripped by the caterpillars.

    We’ve heard there are many varieties of milkweed. Are monarchs particular about which ones they like? Any info would be appreciated.

    Tony Loomis

    August 11, 2019 at 10:10 pm

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