Tag Archives: green heron (Butorides virescens)

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.

Herons

Surprising me from the same shadowy, shielded, shrouded bend in one of the creeks leading to Sunset Bay, the banks of which I often walk during visits to White Rock Lake, two different species of heron gifted me with brief encounters before dashing away in response to my sudden arrival.

I discovered both on two separate days yet in the same location, a spot cloaked by verdant foliage concealing a plethora of perches for such creatures.  My clumsy stumbling through the trees sent both avians into immediate escape and proffered me only the briefest of opportunities to capture the moments.

A green heron (Butorides virescens) perched on a branch (20080629_08323)

Serenely stoic within a spot of shade, this green heron (Butorides virescens) wisely stood its ground without moving as I first approached.  Truth be told, I walked toward the bank of the creek without realizing the bird likewise kept an eye on me.

Most vertebrates with which I have had encounters appear fully capable of knowing when stillness is called for, something tendered evidently and conspicuously in those times when they realize they have not yet been spotted—or at least are not being watched directly.  Walk by without meeting their gaze and they are more likely to stand their ground, to remain motionless until you pass, and that even if you are passing within a breath of their position.  This is true even if you stop moving.

Yet set your eyes upon them and they will respond.  What innate awareness of covert calm when necessary, and what immediate enactment of essential evasion when circumstances warrant.  These are gifts we humans too often fail to fully comprehend and appreciate.

My path took me quite near the heron as it stood upon a fallen tree that bridged the creek from shore to shore.  I stopped beneath a pair of trees before turning toward its position.  That’s when I spied it.

A green heron (Butorides virescens) perched on a branch (20080629_08329)

The time it took for the bird to know the game was up can be measured in the time it took me to press the button on the camera.  It immediately turned and hopped across several branches, the crest on its head rising to full staff just before the creature took to wings and disappeared into the dense woodlands opposite my position.

Since then I have made it a point of trying to remain visibly unaware and uninterested in wildlife as I attempt to photograph it.  This does not always work well—or at all.  I find indirect photography a far more challenging proposition than is its direct counterpart.  Let’s face it: Often it’s quite necessary to actually look at what you’re trying to digitally capture.

Another challenge with unplanned nature photography stems from not always being prepared for the moment.  As I generally venture out with no predefined plans as to what I am looking for or where I am going, preparing the camera for these unexpected shots is impossible.  Whether the wrong settings, the wrong lens or the wrong filters, or a combination of the three, sometimes it’s necessary to ignore the mental instruction to fiddle with the camera first before taking a photo.  It’s a point-and-shoot world, I’m afraid, and that means I can’t always memorialize the experience with the quality I would prefer.

A yellow-crowned night-heron (Nyctanassa violacea) perched on a branch (20080704_08952)

Days later but in the exact same spot, this yellow-crowned night-heron (Nyctanassa violacea) never flinched as I walked by.  My feet traced the very edge of the creek’s bank as I attempted nonchalance for the bird’s sake.  I slowed, fiddled with the camera a bit as I watched it peripherally, then stopped, turned, focused and took the picture in one quick fluid motion.

Both herons immediately took flight and vanished into the confluence.

Unbeknownst to me, two yellow-crowned night-herons had been perched there, the one I could see and another expertly hidden amongst branches so full of greenery as to offer impenetrable armor against prying eyes.  However, the second avian enjoyed a hiding place much closer to my position than the one I could see.  It behooved the winged beauty to flee with its friend lest my sudden halt and interest mean more than snapping a photo.

I watched the two of them fly low over the water before making a graceful turn up and into the trees.  It was then a third of their kind dove down from the branches a stone’s throw from my location and made a sweeping move to follow the first two, its raspy call filling the air perhaps as a warning to others.

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A note on the last photo:

Visible behind the heron is a fishing bobber held in the trees by a frightening amount of tangled line.  I find it disconcerting and deplorable.  Such hazards pose significant threats to the wildlife in the area.

Perhaps you remember the plastic ring tabs around this duck’s head which it suffered with for many months before finally disappearing.

So much human garbage and debris wind up in the lake.  Although I never have found the heart to photograph and share images of the carnage it leaves behind, I would need many more hands if I were to count on my fingers the number of walks I’ve taken which yielded some horrific find, such as a raccoon dead at the water’s edge with fishing line wrapped around its feet, a baby duck still and lifeless with a broken bottle stabbed into its bosom, and a snapping turtle starved to death with a fisher’s hook fastening its jaws permanently closed.  I could go on.

Truth be told, not a walk goes by when I don’t see more and more inhumanity measured in litter.  All the death and suffering it causes here is nothing more than a microscopic example of the macroscopic terrors we unleash worldwide.  Our species is brutish, heartless, troglodytic.