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All:
A useful article on use of bayberries by birds (which launched this thread)=
is at:
https://sora.unm.edu/sites/default/files/journals/auk/v109n02/p0334-p0=
345.pdf
Note that these very saturated wax esters are generally hard to digest. Ma=
ybe that makes them unattractive to most birds, particularly sparrows and o=
thers that might chomp the seeds. Those that do eat them have digestive tri=
cks. Also, "Myrtle" Warblers roll the seeds around in the bill and remove a=
nd swallow the "wax", and I've seen them do that here. I assume Tree Swallo=
ws also do this.
Of course, as noted, the shrub grows especially plentifully on coastal beac=
hes. For a few years these were devastated by salt kill from hurricanes, an=
d I believe wintering "Myrtle" Warbler?s" were accordingly fewer. Should b=
e easy to check this assertion from a formal analysis of CBC records and hu=
rricane occurrences and tracks.
Ian McLaren
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<p>All:<br>
</p>
<p>A useful article on use of bayberries by birds (which launched this thre=
ad) is at:<br>
</p>
<p> <a href=3D"https://sora.unm.edu/sites/default/files/=
journals/auk/v109n02/p0334-p0345.pdf" id=3D"LPlnk450310">https://sora.unm.e=
du/sites/default/files/journals/auk/v109n02/p0334-p0345.pdf</a><br>
</p>
<p><br>
</p>
<p>Note that these very saturated wax esters are generally hard =
to digest. Maybe that makes them unattractive to most birds, particularly s=
parrows and others that might chomp the seeds. Those that do eat them have =
digestive tricks. Also, "Myrtle" Warblers
roll the seeds around in the bill and remove and swallow the "wa=
x", and I've seen them do that here. I assume Tree Swallows also =
do this.<br>
</p>
<p><br>
</p>
<p>Of course, as noted, the shrub grows especially plentifully on=
coastal beaches. For a few years these were devastated by salt kill&n=
bsp;from hurricanes, and I believe wintering
<span style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-siz=
e: 18.66666603088379px; background-color: rgb(255, 255, 255);">
"Myrtle" Warbler</span>​s" were accordingly fewer=
. Should be easy to check this assertion from a formal analysis =
of CBC records and hurricane occurrences and tracks. <br>
</p>
<p><br>
</p>
<p>Ian McLaren<br>
</p>
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