Forty Years Ago in the Lower Rio Grande Valley: Day Nine


Back in late May of 1983, four members of the Lancaster County Bird Club—Russ Markert, Harold Morrrin, Steve Santner, and your editor—embarked on an energetic trip to find, observe, and photograph birds in the Lower Rio Grande Valley of Texas.  What follows is a daily account of that two-week-long expedition.  Notes logged by Markert some four decades ago are quoted in italics.  The images are scans of 35 mm color slide photographs taken along the way by your editor.


DAY NINE—May 29, 1983

“Falcon Dam State Park, Texas”

“To the spillway area after breakfast and saw Ringed Kingfisher, Baird’s Sandpiper, and 2 Black-necked Stilts.  Stopped to photograph the Swainson’s Hawk which had flown in a tree.  Also saw a Blue Grosbeak.”

The Ringed Kingfisher (Megaceryle torquata) was notably larger than the Belted Kingfishers with which we were so familiar, so it was easy to identify.  This was yet another tropical species found north only as far as the Rio Grande Valley of Texas.  Baird’s Sandpiper was a pretty good find for this location in late May.

Swainson's Hawk
The Swainson’s Hawk we discovered yesterday in a water-logged flightless condition had recovered.  Shortly after this photograph was taken and we had taken leave of the bird, we looked back and saw it flying away to the north.  Soon, it was out of sight.

“We drove to Santa Margarita Ranch to search for the elusive Brown Jay.”

While en route to Santa Margarita Ranch, we stopped twice to photograph birds we spotted along the way.

Plain Chachalacas
This family of Plain Chachalacas was spotted crossing the road near Falcon Dam.
Harris's Hawks
Harris’s Hawks are known to hunt in groups, hence their alternate common name “Wolf Hawk”.  We spotted these two and several others, presumably a mated pair and their recently fledged young, hunting an area of thornscrub not far from Santa Margarita Ranch near the town of Falcon Heights, Texas.

Beside the road just outside the entrance to the ranch, we observed a Verdin (Auriparus flaviceps), a tiny chickadee-like like bird with a yellow head and throat.  Verdins reside in both thornscrub and desert throughout the southwestern United States and northern Mexico.

“Rancho Santa Margarita is a group of 8 houses.  Cattle roam at will.  We walked a long way along the river — No luck.  Had lunch in the camper and repeated the morning walk.  Cattle dung all over the place.  The dung rollers were as interesting to watch as the leaf-carrying ants.  Met a Mr. McQueary who had seen them 30 min. ago, so he led us to where he had seen them, but — No luck.”

Upon arriving at Santa Margarita Ranch intending to find Brown Jays (Psilorhinus morio), we drove over the in-ground cattle gate at the entrance and back the dirt driveway to the small cluster of houses where we parked.  We checked in with a resident there and slipped them a dollar or two a head for letting us spend the day on their land.  As we walked away from the houses, we noticed some intermittent movement in a pile of construction debris along the dirt road leading to the river.  Initially thinking we may have caught glimpses of some small rodents dashing around, we watched patiently until we saw at least two Blue Spiny Lizards (Sceloporus cyanogenys) among the lumber and tin.  The pair was obviously finding insects or other sources of prey there

To find Brown Jays, one of the five target species of the trip, Father Tom had advised us to follow the advice in James Lane’s A Birder’s Guide to the Rio Grande Valley of Texas.  The recommendations contained therein brought us to Santa Margarita Ranch.  As was the case upriver near Falcon Dam, the Tamaulipan Saline Thornscrub that covers much of the property turns abruptly to subtropical riparian forest near the banks of the Rio Grande where wetter soils predominate.  The habitat was excellent, and we were certain the birds were there, but despite significant effort, we just couldn’t bump into Brown Jays at Santa Margarita Ranch.

We did however get good looks at another Hook-billed Kite sailing above the trees downriver.  During our second walk, Harold, Steve, and I waded down a short section of the Rio Grande in hopes of getting better looks into an area of shoreline forest too thick to enter by land.  Despite recent rains, the water was low, restricted by gates at Falcon Dam to little more than the flow needed to operate the turbines and generate electricity.  We saw orioles, Red-billed Pigeon, and Great Kiskadee—but no Brown Jays.

Bewick's Wren
We heard an Olive Sparrow and this Bewick’s Wren (Thryomanes bewickii) singing in some thornscrub along the edge of the riparian forest at Santa Margarita Ranch.  It took some effort to finally catch a glimpse of the wren.

“On the way out…found a nest of Pyrrhuloxia and saw a 6 ft. snake hanging from a bush with a rabbit in his mouth.  The snake caught the rabbit by the shoulder and it was working hard to get free.  Finally the snake dropped the rabbit, and they both went out of sight.” 

Pyrrhuloxia
A Pyrrhuloxia (Cardinalis sinuatus) in the thornscrub along the dirt entrance/exit road to Santa Magarita Ranch.
Pyrrhuloxia
The pair of Pyrrhuloxia had their nest well-hidden.  We were lucky to have spotted it, but we dared not approach any closer for pictures for fear of frightening the nestlings and prompting premature fledging.

As we eased our way out the dirt road at Santa Magarita Ranch, we began hearing a blood-curdling series of squeals.  Russ stopped the van and as we peered into the thornscrub, we could catch glimpses of an Eastern Cottontail thrashing around.  At first we thought it had somehow become snagged in the quagmire of prickles on the dense vegetation.  Then we spotted the snake draped over the shrubs and attempting in vain to lift the cottontail off the ground.  The struggle, and the squealing, continued for several minutes as we labored to identify the snake.  As the snake attempted to reposition the cottontail so that it could swallow it head first, the rabbit broke free and escaped.  All was silent as the snake quickly fled as well.  As it slithered away we could see just how long it really was—5 to 6 feet or more.  You know, things really are bigger in Texas.  Based upon its large size, overall tan-brown color, and the rapid speed with which it left the scene, we determined it was a Western Coachwhip (Masticophis flagellum testaceus).

“Back to the spillway at Falcon Dam — No luck.  Met Ron Huffman who is leading a trip for 3 women.  We will meet him at the spillway tomorrow AM early.  Back at our camp site for supper — shower and shave.  The Lesser Nighthawks were trilling late in the evening.”

During the evening, we found Black-throated Sparrow (Amphispiza bilineata) and Scaled Quail (Callipepla squamata) in the area of the campsite.  Then, as darkness settled in, the calls of Common Pauraque, Common Nighthawks, and Lesser Nighthawks (Chordeiles acutipennis) commenced.  We walked down the road to a spot where we could overlook a lower-lying area of thornscrub in hopes of catching a glimpse of some of these nightjars, particularly the latter species, as they patrolled for flying insects.  But under cloudy skies and being miles from any man-made sources of light, it was too dark to see anything flying around.

Scaled Quail
Just before sunset, this Scaled Quail appeared among the thornscrub near our campsite.

Forty Years Ago in the Lower Rio Grande Valley: Day Four


Back in late May of 1983, four members of the Lancaster County Bird Club—Russ Markert, Harold Morrrin, Steve Santner, and your editor—embarked on an energetic trip to find, observe, and photograph birds in the Lower Rio Grande Valley of Texas.  What follows is a daily account of that two-week-long expedition.  Notes logged by Markert some four decades ago are quoted in italics.  The images are scans of 35 mm color slide photographs taken along the way by your editor.


DAY FOUR—May 24, 1983

“AOK Campground—South of Kingsville, Texas”

“Arose at 6:30 A.M. to the tune of Common Nighthawks.  After breakfast, we headed for Harlingen.  While driving south we saw six pairs of Black-bellied Whistling Ducks.  At Harlingen we phoned Father Tom, who is an expert birder for the area.”

As we drove south to Harlingen, much our 100-mile route was through the Laureles division of the King Ranch, the largest ranch in the United States.  It covers over 800,000 acres and is larger than the state of Rhode Island.  The road there was as straight as an arrow with wire fences on both sides and scrubland as far as the eye could see.  Things really are bigger in Texas.

Once in Harlingen, we did two things no one needs to do anymore:

      1.   Find a coin-operated telephone to place a call to Father Tom.
      2.   Ask Father Tom for the latest tips on the locations of rare and/or target birds.

Today, nearly everyone traveling such distances to find birds is carrying a cellular phone and many can use theirs to access internet sites and databases such as eBird to get current sighting information.  Back in 1983, Father Tom Pincelli was a dear friend to birders visiting the Lower Rio Grande Valley.  Few places had a person who was willing to answer the phone and field inquiries regarding the latest whereabouts of this or that bird.  To remain current, he also had to religiously (forgive me for the pun) collect sighting information from the observers with whom he had contact.  For locations elsewhere across the country, a birder in 1983 was happy just to have a phone number for a hotline with a tape-recorded message listing the unusual sightings for its covered region.  If you were lucky, the volunteer logging the sightings would be able to update the tape once a week.  For those who dialed his number, Father Tom provided an exceptionally personal experience.

Since 1983, Father Tom Pincelli, also known as “Father Bird”, has tirelessly promoted birding and conservation throughout the Lower Rio Grande Valley.  His efforts have included hosting a P.B.S. television program and writing columns for local newspapers.  He has been instrumental in developing the annual Rio Grande Valley Birding Festival.  The public sentiment he has generated for the birding paradise that is the Lower Rio Grande Valley has helped facilitate the acquisition and/or protection of many key parcels of land in the region.

“After receiving information on locations of Tropical Parula, Ferruginous Pygmy Owl, Hook-billed Kite, Brown Jay, and Clay-colored Robin, we went on to check out the Brownsville Airport where we will meet Harold and Steve Thursday noon.”

If we were going to see these five species in the American Birding Association listing area, then we would have to see them in the Lower Rio Grande Valley.  All five were target birds for each of us, including Harold who had few other possibilities for new species on the trip.  Father Tom provided us with tips for finding each.

I noticed as we began moving around Harlingen and Brownsville that Russ was swiftly getting his bearings—he had been here before and was starting to remember where things were.  His ability to navigate his way around allowed us to keep moving and see a lot in a short time.

In Harlingen, we easily found Mourning Doves and the non-native Rock Pigeons, species we see regularly in Pennsylvania.  We became more enthusiastic about doves and pigeons soon after when we saw the first of the several other species native to south Texas, the diminutive Inca Dove (Columbina inca), also known as the Mexican Dove.

“Next, to the Brownsville Dump to see the White-necked Ravens — Then to Mrs. Benn’s in Brownsville for the Buff-bellied Hummingbird.  Both lifers for Larry.”

For birders wanting to see a White-necked Raven in the Lower Rio Grande Valley, the Brownsville Dump was the place to go.  With very little effort—excluding a trip of nearly 2,000 miles to get there—we found them.  Today, birders still go to the Brownsville Dump to find White-necked Ravens, though the dump is now called the Brownsville Landfill and the bird is known as the Chihuahuan Raven (Corvus cryptoleucus).

Mrs. Benn’s home was in a verdant residential neighborhood in Brownsville.  She welcomed birders to come and see the Buff-bellied Hummingbirds that visited her feeder filled with sugar water.  I don’t recall whether or not she kept a guest book for visitors to sign, but if she did, it would have included hundreds—maybe thousands—of names of people from all over North America who came to her garden to get a look at a Buff-bellied Hummingbird.  After arriving, we waited a short time and sure enough, we watched a Buff-bellied Hummingbird (Amazilia yucatanensis) sipping Mrs. Benn’s home-brewed nectar from her glass feeder.  This emerald hummingbird is primarily a Mexican species with a breeding range that extends north into the Lower Rio Grande Valley of Texas.  When not breeding, a few will wander north and east along the Gulf Coastal Plain as far as Florida.

Other finds at Mrs Benn’s included White-winged Dove (Zenaida asiatica), Ash-throated Flycatcher (Myiarchus cinerascens), Brown-crested Flycatcher (Myiarchus tyrannulus), and Black-crested Titmouse (Baeolophus atricristatus), a species also known as Mexican Titmouse.

White-winged Dove
We identified this White-winged Dove at Mrs. Benn’s house in Brownsville.
Green Anole
In Mrs. Benn’s lush subtropical garden beneath a canopy of tall trees we found this male Green Anole (Anolis carolinensis) displaying its red throat patch.  (Vintage 35 mm image)

The Lower Rio Grande Valley from Rio Grande City east to the Gulf of Mexico is actually the river’s outflow delta.  At least six historic channels have been delineated in Texas on the north side of the river’s present-day course.  An equal number may exist south of the border in Mexico.  Hundreds of oxbow lakes known as “resacas” mark the paths of the former channels through the delta.  Many resacas are the centerpieces of parks, wildlife refuges, and housing developments.  Still others are barely detectable after being buried in silt deposits left by the meandering river.  Channelization, land disturbances related to agriculture, and a boom in urbanization throughout the valley have disconnected many of the most recently formed resacas from the river’s floodplain, preventing them from absorbing the impact of high-water events.  These alterations to natural morphology can severely aggravate flooding and water pollution problems.

The Lower Rio Grande Valley
The Lower Rio Grande Valley is the site of a boom in urbanization.  Undeveloped private holdings and government lands including numerous parks and refuges provide sanctuary for some of the valley’s unique wildlife.  The parcels colored dark blue on the map are units of the Lower Rio Grande Valley National Wildlife Refuge.  (United States Fish and Wildlife Service base image)

“On to Santa Ana National Wildlife Refuge.  We walked to Pintail Lake and saw 6 Black-bellied Whistling Ducks and 2 Mississippi Kites and 1 Pied-billed Grebe.  We drove the route thru the park with great results—Anhingas, Least Grebe, and more Black-bellied Whistling Ducks.

Santa Ana National Wildlife Refuge on the Rio Grande is not only a birder’s mecca, 300 species of butterflies have been identified there.  That’s half the species known to occur in the United States!  Its subtropical riparian forest and resaca lakes provide habitat for hundreds of migratory and resident bird species including many Central and South American species that reach the northern limit of their range in the Lower Rio Grande Valley.  Two endangered cats occur in the park—the Ocelot (Leopardus pardalis) and the Jaguarundi  (Herpailurus yagouaroundi).

Ocelot
In the Lower Rio Grande Valley, the secretive Ocelot, like the Jaguarundi, is at the northern limit of its eastern range. Time will tell how urban development including construction of the border wall will impact the distribution and survival of these and other terrestrial species there.  (A modern digital image)
Jaguarundi
Jaguarundi.  (United States Fish and Wildlife Service image)

We saw no cats at Santa Ana, but did quite well with the birds.  Our list included the species listed above plus Cattle Egret (Bubulcus ibis); Louisiana Heron, now known as Tricolored Heron (Egretta tricolor); Plain Chachalacas; Purple Gallinule; Common Gallinule (Gallinula galeata); American Coot; Killdeer; Greater Yellowlegs; the coastal Laughing Gull (Leucophaeus atricilla); and its close relative of the central flyway and continental interior, the Franklin’s Gull (Leucophaeus pipixcan).  Others finds were White-winged Dove, Mourning Dove, Inca Dove, Yellow-billed Cuckoo, Golden-fronted Woodpecker, Ladder-backed Woodpecker (Dryobates scalaris), Brown-crested Flycatcher, Altamira Oriole, Great-tailed Grackle, and House Sparrow.  A real standout was the colorful Green Jay (Cyanocorax luxosus), yet another tropical Central American species found north only as far as the Lower Rio Grande Valley.

Mississippi Kite
During spring (April-May) and fall (August-September), Mississippi Kites migrate by the thousands through the skies of the Lower Rio Grande Valley.  Both Santa Ana and nearby Bentsen-Rio Grande State Park have hosted formal hawk counts in recent years.  (Vintage 35 mm image)
Black-necked Stilt
A Black-necked Stilt at Santa Ana N.W.R.  (Vintage 35 mm image)
Least Grebe
A Least Grebe (Tachybaptus dominicus) with young in a man-made canal that mimics flooded resaca habitat at Santa Ana National Wildlife Refuge.  (Vintage 35 mm image)
Black-bellied Whistling Ducks at Santa Ana National Wildlife Refuge
Black-bellied Whistling Ducks take off from a pond at Santa Ana National Wildlife Refuge.  (Vintage 35 mm image)
Altamira Oriole
The spectacular colors of Altamira Orioles (Icterus gularis) dazzled us every time we saw them.  This was my first, seen soon after arriving at Santa Ana N.W.R. where the checklist still had the species listed under its former name, Lichtenstein’s Oriole. The Altamira Oriole ranges north of Mexico only into the Lower Rio Grande Valley.  (Vintage 35 mm image)

“We were unlucky not to find a campground at McAllen, so we went on to Bentsen State Park where we got a camp spot.  After a sauerkraut supper, we birded till dark, then showered and wrote up the log.  Very hot today.”

Bentsen-Rio Grande Valley State Park, like the Santa Ana National Wildlife Refuge, is located along the Rio Grande river and features dense subtropical riparian forest that grows in the naturally-deposited silt levees of the floodplain surrounding several lake-like oxbow resacas.  Montezuma Bald Cypress (Taxodium mucronatum) is a native specialty found there but nowhere north of the Lower Rio Grande Valley.  During our visit, we marveled at the epiphyte Spanish Moss (Tillandsia usneoides) adorning many of the more massive trees in the park.  Willows lined much of the river shoreline.

Over time, flood control projects such as man-made dams, drainage ditches, and levees have impaired stormwater capture and aquifer recharge in the floodplain.  These alterations to watershed hydrology have resulted in drier soils in many sections of the Lower Rio Grande Valley’s riparian forests.  Where drier conditions persist, xeric (dry soil) scrubland plants are slowly overtaking the moisture-dependent species.  As a result, the park’s woodlands are composed of trees with a variety of microclimatic requirements—Anaqua (Ehretia anacua), Cedar Elm (Ulmus crassifolia), Texas Ebony (Ebenopsis ebano), hackberry, mesquite, Mexican Ash (Fraxinus berlandieriana), retama, and tepeguaje are the principle species.  The park’s subtropical Texas Wild Olive (Cordia boissieri) grows in the wild nowhere north of the Lower Rio Grande Valley.

While a majority of birders visiting Benten-Rio Grande State Park come to see the more tropical specialties of the riparian woods, searching the brushy habitat of the park’s scrubland can afford one the opportunity to see species typical of the southwestern United States and deserts of Mexico.  This scrubland of the Lower Rio Grande Valley is part of the Tamaulipan Mezquital ecoregion, an area of xeric (dry soil) shrublands and deserts that extends northwest from the delta through most of south Texas and into the bordering provinces of northeastern Mexico.

Our campsite was located in prime birding habitat.  We were a short walk away from one of the park’s flooded oxbow resacas and vegetation was thick along the roadsides.  It was no surprise that the place abounded with birds.  An evening stroll yielded Plain Chachalaca, White-winged Dove, Mourning Dove, White-fronted Dove, Golden-fronted Woodpecker, Brown-crested Flycatcher, Green Jay, Altamira Oriole, Great-tailed Grackle, and Bronzed Cowbird (Molothrus aeneus).  At nightfall, we listened to the calls of an Eastern Screech Owl (Megascops asio), Common Nighthawks, and Common Pauraque (Nyctidromus albicollis), a nightjar of Central and South America that nests only as far north as the Lower Rio Grande Valley.  The Common Pauraque is the tropical counterpart of the Eastern Whip-poor-will, a Neotropical migrant that nests in scattered forest locations throughout eastern North America.

A Plain Chachalaca at Bentsen-Rio Grande Valley State Park.
The Plain Chachalaca (Ortalis vetula), a pheasant-like wildfowl of the dense riparian forest and scrubland at Bentsen-Rio Grande Valley State Park.  (Vintage 35 mm image)
Plain Chachalacas
Seldom did we see a Plain Chachalaca alone, there were always others nearby.  (Vintage 35 mm image)
White-fronted Dove
Like the chachalacas, this White-fronted Dove was attracted to some birdseed scattered on a big log behind our campsite.  This species is now known as White-tipped Dove (Leptotila verreauxi) and is at the northern tip of its range in the Lower Rio Grande Valley.

I would note that we saw no “snowbirds”—long-term vacationers from the northern states and Canada who fill the park through the cooler months of fall, winter, and spring.  They were gone for the summer.  But for a few other friendly folks, we had the entire campground to ourselves for the duration of our stay.