Tag Archives: snowy egret (Egretta thula)

The rookery – Part 1

Farms and ranches.  Urban and suburban sprawl.  Highways and byways.  Throughout the “civilized” world, these anthropogenic artifacts have gone to great lengths in reducing the availability of natural habitat for plants and animals.  Traveling some distance from humanity seems a prerequisite just to see nature doing its thing in what little space we’ve left for it.  This explains why most people in developed areas rarely see anything more than a handful of bird species, the occasional rat or mouse or ant or wasp, and almost no flora save that planted in manicured lawns and decorative gardens.

Conversely, nature has an interesting way of taking advantage of what few opportunities we provide it.  These oft overlooked silos of life accommodate surprising diversity where it’s least expected.  And that creates an opening for discovery, a chance a lot of people won’t otherwise have.  Therein lay the seed of appreciation that can make a city dweller comprehend the beauty beyond—and the need to protect it.

As the crow flies, it’s less than four miles/six kilometers north of downtown Dallas: the University of Texas Southwestern Medical Center campus, a large complex of health facilities and college buildings smack-dab in the middle of the hospital district.  For miles around, you can’t throw a stone without hitting a doctor or nurse or medical student—and winding up in court for the trouble!  Yet nestled in the middle of a bustling urban landscape and located on the campus grounds lies an example of nature’s irony and majesty.


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A small wooded area at the intersection of two major roads.  It covers approximately 3.5 acres/1.4 hectares and serves as respite for students, faculty and patients, a breath of verdant escapism outside cold stone walls.  To leave the sterile smell of the hospital for a few minutes and listen as gentle breezes whisper through the trees probably has as much a medicinal effect as any prescription drug.  (Recent studies showing the impact of nature on the human mind and body certainly agree.)

But that humble area of trees and brush also serves another purpose, one protected by state and federal laws.  It’s a rookery for migratory birds.

A great egret (Ardea alba) perched in a tree (2009_04_19_015737)

I visited the site a few weeks ago.  I’m embarrassed to admit it was the first time in my life…and I’ve lived here almost 40 years.  It seems I’ve spent too much time running here and there, always looking for the exotic or out-of-the-way opportunities, and in the process I ignored what should be a cherished Dallas landmark.

Two black-crowned night-herons (Nycticorax nycticorax) perched in the treetops (2009_04_19_015683)

Like an imaginary world, the rookery presents as a surreal oasis in the middle of the city.  To get close to it, one must stand within a cluster of multi-story buildings and heavy traffic, yet the number of species nesting here defies belief.  Great egrets flit across six-lane roads.  Anhinga circle above the treetops.  Snowy and cattle egrets busy themselves with collecting twigs for their nests.  Green and little blue herons lurk in the shadows trying to remain invisible.  Once in a while a tricolored or great blue heron shows up.  And white ibises sometimes nest here as well, although they tend towards the middle of the woods, a forbidden realm that offers them escape from the city around them.

Two snowy egrets (Egretta thula) building a nest (2009_04_19_015774)

Then there are the robins and kingbirds and flycatchers, and the sparrows and wrens and finches.  Starlings, grackles, mockingbirds, doves, woodpeckers and an endless parade of other species likewise dwell or hunt here.  The magnitude, the volume of life in this tiny patch of land seems incomprehensible at best.  That’s never more true than when one considers that it’s a small green dot in the middle of a gray concrete jungle.

A tricolored heron (a.k.a. Louisiana heron; Egretta tricolor) perched in a tree (2009_04_19_016082)

Birds aren’t the only inhabitants.  Fox squirrels and Virginia opossums scurry about the branches and understory while trying to avoid the angry retribution of nesting herons.  If you’ve never seen a great egret wallop a squirrel for being too close to its nest, I assure you the squirrel always loses.  And it ain’t pretty.

A green heron (Butorides virescens) perched on a branch over a pond (2009_04_19_016309)

Signs around the periphery of the grove adamantly declare the obvious: “Bird Nesting Area: NO TRESPASSING.”  These manifest the university’s responsibility…but not necessarily its wishes.  Controversy surrounds this wonder, this beguiling gem amidst mundane people and their ways.  While so many pass by without noticing, even the Texas Parks and Wildlife Department pays attention.

An American robin (Turdus migratorius) standing in dirt looking for food (2009_04_19_015993)

I contacted UT Southwestern about the rookery.  I asked for more than the usual press release: I added several specific questions related to historical treatment of the area and what plans exist for the future.  I have yet to hear back, although I hope to include their response in future installments of this miniseries.

A Virginia opossum (a.k.a. possum; Didelphis virginiana) looking down from within a tree (2009_04_19_016229)

Meanwhile I’m left with a sense of awe and intrigue.  I’ve seen alligators and crocodiles, killer snails and killer snakes, rodents larger than most dogs and rodents smaller than a thumbprint, whales and wasps of many stripes, and countless birds that fill every niche of nature’s womb, yet still I find myself beguiled by the bounty of life that finds home and safety in a wee bit of woods hidden within a concrete jungle.  It’s a testament to life that many hundreds of nests will be built there—again.

The rookery calls me back while the spring nesting season continues.  I intend to return as often as I can to document this marvelous dichotomy, a simple little spot that reminds me of what Rachel Carson penned in The Sense of Wonder:

For most of us, knowledge of our world comes largely through sight, yet we look about with such unseeing eyes that we are partially blind.  One way to open your eyes is to ask yourself, ‘What if I had never seen this before? What if I knew I would never see it again?'”

Indeed, what if…

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Photos:

[1] Great egret (Ardea alba)

[2] Black-crowned night-herons (Nycticorax nycticorax)

[3] Snowy egrets (Egretta thula)

[4] Tricolored heron (a.k.a. Louisiana heron; Egretta tricolor)

[5] Green heron (Butorides virescens)

[6] American robin (Turdus migratorius)

[7] Virginia opossum (a.k.a. possum; Didelphis virginiana)

[cross-posted to The Clade]

MR NOT DUCKS

To finish what I started for dearest nathalie with an h, who claims vehemently—and overmuch—that she sees only ducks when visiting White Rock Lake, I thought it time to share some of the other waterfowl who live here but who are in fact not ducks.  To be more precise, these are herons[1].

A cattle egret (Bubulcus ibis) perched in winter trees (2009_02_14_009307)

A cattle egret (Bubulcus ibis) perched in the trees across the lagoon[3].

A green heron (Butorides virescens) standing in verdant spring foliage (20080629_08323_n)

A green heron (Butorides virescens) hiding amongst branches draped over a creek.

A black-crowned night-heron (Nycticorax nycticorax) perched on fallen limbs (2009_02_03_006217)

A black-crowned night-heron (Nycticorax nycticorax) trying to sleep on a sunny afternoon.

A snowy egret (Egretta thula) perched on a log in Sunset Bay (20080701_08757)

A snowy egret (Egretta thula) perched on a log in Sunset Bay.

A great egret (Ardea alba) standing along the banks of a creek (2009_03_07_012299)

A great egret (Ardea alba) standing along the banks of Dixon Branch near the confluence.  (I think the mallard drake is there for decorative purposes.)

A great blue heron (Ardea herodias) standing in the treetops (2008_12_28_003901)

A great blue heron (Ardea herodias) perched high in the treetops[4].

A yellow-crowned night-heron (Nyctanassa violacea) resting in the middle of a pond thick with vegetation (2009_04_16_015547)

A yellow-crowned night-heron (Nyctanassa violacea) resting in the middle of a pond thick with vegetation.

A little blue heron (Egretta caerulea) stalking the shallows of a plant-filled swamp (2009_04_16_015585)

A little blue heron (Egretta caerulea) stalking the shallows of a plant-filled swamp[5].

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Notes:

[1] While these are all herons by definition, some are called egrets.  ‘Egret’ is the name given to heron species that is normally all white[2] and that grows long, showy plumes in the breeding season.

[2] The term “all white” does not refer to color morphs, forms of albinism or those species that demonstrate white plumage only during adolescence.

[3] The cattle egret perched in trees some distance from me.  Given its small size yet high reflective properties when matched against barren winter trees, I assumed at the time that it was a great egret curled up sleeping near the water’s edge.  Only when I processed the images much later in the day did I see it clearly enough to recognize my error, after which I cursed myself for not taking more than one cursory photo.

[4] Undoubtedly the most difficult heron species to photograph, great blue herons are flighty creatures who avoid humans at all costs.  It’s more likely for me to see one take to the skies and disappear behind treetops than it is to see one standing still near enough and long enough for me to capture a good picture.

[5] Little blue herons are anything but little, yet they are smaller than great blue herons.  This has to be my favorite heron species given its color, something I failed to capture in this image as I was looking at a dark bird in the middle of verdant foliage covered with water, water reflecting sunlight right into my face and the camera lens.  Nevertheless, you can see this bird’s plumage is a vaporous menagerie of my favorite color: purple.

[6] As for the title, see the bottom of this post for an explanation.

Why birds?

When I began the process of purging my photo collection, essentially sweeping away the past to make room for the future, I started with birds, something you’ll see in this post and others to follow.

But why birds?

A male wood duck (Aix sponsa) molting into eclipse plumage (20080628_08107)

Good question.

I have a lot of bird pictures.  Yet that’s not really the answer to the question.

A complete albino rock dove (a.k.a. common pigeon; Columba livia) walking into the grass (20080628_07967)

I think I began with birds since our avian friends offer a mix of challenge and ease that results in a veritable bounty of images.

Then again, perhaps I complicate matters when a simpler answer would more appropriately address the question.

A snowy egret (Egretta thula) with a small fish in its bill (20080614_06582)

While I could say it’s because I love birds almost as much as I love insects, even that would not provide the full truth of why I started with our avian friends.

A northern mockingbird (Mimus polyglottos) perched in a treetop (20080518_05644)

It all boils down to this one fact: it’s winter.

A female brown-headed cowbird (Molothrus ater) in the grass (20080426_04903)

Even here in North Texas, winter means an end to the bounty of arthropods and flora and reptiles and a great deal of nature’s many wonders.  Most trees are left stark and barren along with the vast majority of plants as they wither into their cocoons of hibernation or death; cold-blooded creatures fade with the passing seasons into a frigid slumber or the end of their generation; insects and arachnids shrink away beneath the blanket of the first killing freeze; and ultimately most of the beauty I so enjoy disappears under winter’s cloak.

Yet birds thrive, at least where I live, and their numbers and kinds explode as residents leave for warmer days and nights at the same time migrants arrive trying to escape colder temperatures to the north.

A scissor-tailed flycatcher (Tyrannus forficatus) perched in a tree (20080426_04717)

So expunging historic photos of birds came naturally since, right now, I’m snapping a lot of bird pictures.

It’s no more complicated than that.  Besides, I have yet to go through the arthropods, plants, mammals and reptiles that comprise the remainder of my collection.  Rest assured they will have their time in the spotlight.

— — — — — — — — — —

Photos:

[1] A male wood duck (Aix sponsa) who’s molting into eclipse plumage.  He wanted to know who and what I was, but his curiosity never won the battle it waged with his sense of self-preservation.  Instead, he followed me along the north shore of White Rock Lake, always staying near enough to keep an eye on me whilst simultaneously being distant enough to feel safe.

[2] A complete albino rock dove (a.k.a. common pigeon; Columba livia).  I have seen partial albinism, incomplete albinism and imperfect albinism in rock doves (along with many other creatures), but this was the first time I ever saw complete albinism in this species.  It foraged and flocked with the dule, yet it stood out like a lone redwood tree in a hayfield.

[3] A snowy egret (Egretta thula) with a small fish in its bill.  This beautiful creature spent the morning wading in the shallows of Sunset Bay looking for something to eat.  I watched it miss more meals than I could count.  Just when I felt the poor thing would go hungry, it caught a small fish and enjoyed the fruit of its labor.

[4] A northern mockingbird (Mimus polyglottos).  Perched in the top of a tree under which I stood unaware of its presence, this marvelous parent watched me intently as its offspring fledged a few steps away.  I absentmindedly moved toward the child, and it was then the dutiful guard made its presence known with a sweeping dive at my head coupled with the scream of a marauder moving in for the kill.  I snapped the photo as I moved away.

[5] A female brown-headed cowbird (Molothrus ater).  On a cloudy day and from quite a distance, I felt certain this was nothing more than a sparrow (albeit a large-than-normal sparrow).  Bad lighting can often hide the difference what is and what isn’t.  I walked away from that moment feeling she was something else entirely, something boring, so I was thrilled I took the photo as it brought into focus what I had really seen.

[6] A scissor-tailed flycatcher (Tyrannus forficatus).  I watched this individual and one other as they performed their magical aerial ballet in the light of sunrise.  Catching insects in flight is neat enough on its own; doing so with that flowing, unbelievably long tail creates an altogether different image.

Snowy egret

In morning light dappling through trees as the sun climbs above the horizon, my favorite spot on the lake bustles with activity.  Diurnal nature yawns and stretches and climbs from bed as a new day starts; its nocturnal counterpart slips under the covers and settles in for restful sleep.

Sunset Bay punctuates the hour with hunting, preening, bathing, grazing, and all manner of activity engaged in by the wondrous life that calls this place home.

A snowy egret (Egretta thula) wading through the shallows at White Rock Lake (20080614_06577)

This snowy egret (Egretta thula) in breeding plumage spends much time wading near shore in its hunt for breakfast.

A snowy egret (Egretta thula) standing in the shallows at White Rock Lake (20080614_06584)

It keeps me rather busy trying to follow it since a great deal of brush and reed growth forces me to dash to and fro seeking a place where I can take pictures.

A snowy egret (Egretta thula) standing in the shallows at White Rock Lake (20080614_06590)

Many times I see it strike the water; more than a handful of times I see it succeed in catching prey.

A snowy egret (Egretta thula) standing atop a log at White Rock Lake (20080614_06598)

Both an active and passive hunter, sometimes it stands still and waits for food to venture within reach and sometimes it moves quickly through the shallows stirring up food by shuffling its feet along the bottom.

A snowy egret (Egretta thula) hunting in the shallows at White Rock Lake (20080614_06613)

Rarely still for more than a minute and always in those places where I have no direct line of sight, eventually I leave the bird to its meal and wander toward the next adventure.