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WARBLERS



First we'll bore you to tears with some warbler talk, and
if or when you can't take it, scroll down to the pictures.
:)

Warblers are many people's favorite birds. Stunning beauty,
fast action, endless variety, amazing lives, most with long
migrations, and in fall, identification challenges.
Most don't really warble very well, but their songs are
favorites, each usually with A and B songs, plus a selection
of call notes.... imagine 55 chip notes to learn!
How exciting can it get!?!  Each chip slightly different
in its own special way, when learned may offer the best most
diagnostic field mark one could ask for.  The thrill of it all!

Here we'll show a few of them, and might even include some photos
taken elsewhere to better illustrate them.  About 40 of North
America's 55 species are known from the Sabinal River Valley area.
Only about 20 and change occur in any given year, if you are lucky.
I have seen 30+ species at Utopia Park (in 10 yrs.).  With its
30 years of spring birder coverage Lost Maples shows 33 species
of warblers on its list.  BUT nearly HALF of them (15) have
been seen only once, they are accidental, less than 20 species are
reported annually there.

Most of the warbler diversity here is migrants, and that is far
better in spring than fall.  Only a few types winter here.
The biggest diversity single day I had here was a late season
cold front on May 2, 2011, with 21 species around Utopia, most
at the park.  That is a once in a decade event, any day you
find 10 species here you did good.

We have a few nesting species of warblers locally, 5 regular annual
breeders, and 3 species of toe-holder colonists that are perhaps
wishing and hoping they could breed, maybe they are.  Of course
most have at least heard of the Golden-cheeked Warbler due to
its endangered status.  Though widespread locally, it is best seen
at Lost Maples SNA, mid-March through June, though present through
July, they can be tough late in season.  It has its own page
(linked on bird photo index page among other spots).

Other warblers nesting there (LMSNA) and other headwater stream habitats
locally like Big Springs over the divide, are Louisiana Waterthrush,
and Black-and-white Warbler.  Some Black-and-whites nest along
Sabinal River where mixed deciduous.  Anywhere along the big rivers in
tall Cypress trees there are nesting Yellow-throated Warbler,
of a vocally distinct flavor, and a ball moss specialist here.
Edwardsplateauensis I call it.  Finally, the 5th regular nesting
warbler is Yellow-breasted Chat which uses brushy areas either
in the riparian flood zone, or around fields and woodland edges.

A note on the Yellow-throated Warbler song type here.  All across
America, found in the entire eastern half, Yellow-throated Warblers sing
essentially the same song, a descending Canyon Wren like clear whistled
down scale run: slee slee slee slee slee slee slee slee slee. 
Sometimes with a high thick TIK note at the end for flourish.
Here, on the Medina, Sabinal, Frio, Nueces and Guadalupe Rivers at
least, they sing a lazy modulation between two frequencies, with a
different emphatic ending. Some might say more like between a Hooded
and Chestnut- sided Warbler, or even a Yellow-rumped Warbler, but
quite very unlike all the other Yellow-throated Warblers in the U.S..
It is sort of a slow lazy "we see we see we SEE you two".

The line of seperation of this vocally distinct population is a map that
has never been drawn, in fact when I asked about it on Texbirds I got
a bunch of quizzical stares, apparently no one had noticed these bird's
distinct song type here before.  I am surprised Oberholser missed this,
considering things like Bexar Brown Thrasher, but dead birds don't sing.
These Yellow-throated can also show an almost orange tint to the lower throat,
very briefly in spring, which wears away quickly.  I do not know if the
rest show that or not.  Here the species is abundant, territories ca. 200-300
linear feet of river gallery forest, and are edge to edge.  It is a Ball Moss
(Tillandsia recurvata) specialist, feeding heavilly and nesting in it.  Nesting
is usually high in the Bald Cypress that line the major rivers, but it does
nest away from the river and Cypresses in live-oak mottes that are heavily
infested with Ball Moss.



Black-and-white Warbler
First summer male Black-and-white Warbler, a bark specialist
that works the trunks and large branches of trees.


In the borderline irregular category, there are a few other
warblers perhaps trying to breed locally.  There are what seem to
be nesting Northern Parula across the divide from Lost Maples at
Big Springs, the Frio river headwaters, discovered by Tony Gallucci.
They are a less than annual spring migrant on the Sabinal River.

There are no summering Northern Parulas along the Frio or Sabinal
Rivers.  They only occur as rare migrants in April.  The above
mentioned probable nesting Northern Parula are way above Leakey
in a unique exceptionally lush headwaters micro-habitat, unlike
the Frio or Sabinal gallery forest habitats along their corridors.

Then territorial singing male Tropical Parula are nearly annual
along the big south-draining rivers in April and May, in small but
multiple numbers, but no local breeding is known or proven. 
Almost all are males, some years two or three occur, trolling
with song, one stayed 6 weeks on territory near Utopia.

A PAIR of Rufous-capped Warbler was resident a couple years
at Concan until a 3-day ice storm.  There are numerous local
records and it should be expected to continue attempts at
colonization, as the Tropical Parula is.  So three additional
species of warblers have toeholds, sorta, locally, as extremely
low density presumed attempting breeders, though a nest has
never been found in the state for the Rufous-capped, or in the
hill country for the Tropical Parula.  Any suspected instance
requires good evidence documentation.

For spring warbler migration, Nashville Warbler is the only abundant
species locally.  Yellow-rumped (mostly Myrtle, some Audubon's),
and Orange-crowned, the next two most numerous, could qualify as
common migrant species.  Then probably Yellow Warbler is the 4th
most common.  Black-throated Green and Wilson's are 5th
and 6th most common and Black-and-white 7th. Of those species
multiples are expected best day of passage each spring.  After
that it gets slim pickens quickly, and nothing could be considered
common.  This is not migrant warbler heaven, with its low
diversity of generally inland or overland migrants, and no focal point
of geographics or habitat (concentration factor).  It takes work
to see 20 species in a spring migration season, and a quarter of those
will likely be "only one individual seen" species.

The lack of concentration factor, where a billion acres all look
the same from the sky, a tree everywhere, no matter where the bird
looks, especially shows in fall when besides Yellow Warbler, seeing
multiples of almost anything is unusual.  Very few warblers pass
through the area (detectably) in fall until late October or November
when the Yellow-rumped Warblers arrive.  In winter there will be
Myrtle (Yellow-rumped) and a few Orange-crowned for sure.  Most
winters there will be some Pine Warblers along any drainage corridor,
especially at Garner S.P.  Most warblers are highly insectivorous,
and only those that can eat other things like berries, or seeds,
can winter northward usually. 

Here are a few poor pictures of some of the warblers found here...




Yellow-throated Warbler
Yellow-throated Warbler


Common Yellowthroat
Common Yellowthroat
(yes the names can be confusing)


Orange-crowned Warbler
Orange-crowned Warbler
some are named for the hardest part to see.



Orange-crowned Warbler
Orange-crowned Warbler, which
will use hummer feeders in winter



Pine Warbler Pine Warbler
Pine Warbler, adult right, immature left, is
regular in low numbers in winter.




Myrtle Warbler
"Myrtle" form of Yellow-rumped Warbler


Prothonotary Warbler
Prothonotary Warbler


Rufous-capped Warbler
Rufous-capped Warbler


Rufous-capped Warbler
Rufous-capped Warbler


Tropical Parula
Tropical Parula, a rarity locally


Golden-cheeked Warbler
Golden-cheeked Warbler


Golden-cheeked Warbler
Golden-cheeked Warbler


Townsend's Warbler Townsend's Warbler
Townsend's Warbler at our bird bath Sept. 25, 2013



Kentucky Warbler
Kentucky Warbler, male at Utopia Park Aug 9-18, 2009.
Accidental in fall in west half of Texas.



Louisiana Waterthrush
Louisiana Waterthrush, juvenile


Louisiana Waterthrush
Louisiana Waterthrush, adult





Golden-cheeked Warbler
Golden-cheeked Warbler male feeding fledgling
(taken through telescope from safe distance)


Ruby-crowned Kinglet
Ruby-crowned Kinglet, not a warbler
but often with them in winter.





Louisiana Waterthrush
Louisiana Waterthrush, adult


Louisiana Waterthrush
Louisiana Waterthrush, adult


One last chip note, on Louisiana Waterthrush identification here.
Some field guides stress or tout the pink buff flanks and two-toned
(bicolored) eye-line as being critical to ID it.  Note in the
two above photos, perhaps closer than the average field view,
these things are not apparent.  Such is often if not typically
the case here in spring to early summer.  Not all Lousiana
show the flank color, as it wears off over winter, causing many
mis-identified reports of Northern Waterthrush at Lost Maples.
It goes from absent to boldly apparent in late summer when they
complete pre-basic molt around late July or August usually.

Also note contrary to some published accounts (Dunn and Garrett
Peterson Warbler Field Guide), any Louisiana Waterthrush after early Sept.
does not need documentation here.  They have been detected present
and singing into September locally.  Tony Gallucci had them
one year on Nature Quest at Big Springs singing on Sept 15 still,
and another year on a NQ walk he and I had it singing there on Sept. 21.
So, many elsewhere may have left there territories by early Sept., and
some of these do too, but some of these are often still nesting again
in August, and past mid-September, still singing on territory sometimes.




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