Grand Junction Audubon Society birders

Follow local birders in pursuit of their life lists. For more visit audubongv.org.

Page 4 of 20


GREEN MANSIONS

By Nic.Korte
Tuesday, January 12, 2016

I hear a soft scuffle behind me. Holding my breath, I wait. A Puma? A Jaguar? More likely a Tamamdua (silky anteater) or an agouti (a large rodent). A healthy jaguar population exists a very few miles away, but here at Costa Rica's Las Cruces Biological station, I am probably too near the village of San Vito. The scuffle is that of a young jogger--probably a graduate student working with the tropical plants for which the Las Cruces Biological Station is famous.

(Visitor cabins at Las Cruces)

Light on her feet, she trots on by with a smile and a wave. A young woman running in the jungle led me to think of the novel, Green Mansions by W.H. Hudson. The book, set in the American Neotropics, is a fable about how the innocent are often misunderstood and destroyed. One of the book’s main characters is Rima, a young girl who lives in harmony with the wilderness. Other inhabitants find her confusing and frightening and decide she is the cause of any misfortunes they encounter. Eventually, they find her and kill her. The plot is an apt metaphor for what I have been seeing. The overwhelming fecundity and beauty of the tropical jungle is easy to romanticize. Unfortunately, my next realization is how much has been destroyed because it wasn’t understood.

A few decades ago, the jogger would have been dodging either cattle or coffee plants. But, just thirty years before that, this area was wilderness. In the 1950s and 1960s, settlers, including Europeans and North Americans, decided the area was suitable for agriculture. One of those early settlers, now in his 80s, has published two books about their struggles. He begs forgiveness from future generations. "We didn't know what we were doing," he says. He explains that if they had understood the soil, and the complexity of the natural environment, they would have known their efforts were doomed. The area was too steep, the soils, as always in the rainforest, were too poor. Now, much of the area consists of exposed and eroded soils and shrubby, brushy areas indicative of unwise land use.

Fortunately, some of the nearby highlands were not so heavily settled, and are mostly preserved today as part of the La Amistad National Park—a UNESCO World Heritage Site comprised of more than 570,000 hectares in the Talamanca Mountains of Costa Rica and Panama. At lower elevations, there are still a few forest remnants, and there are restorations such as the location where I encountered the jogger.

 (Green Honeycreepers are common at Las Cruces)

This area was reclaimed by Robert and Catherine Wilson who had owned a tropical nursery in Florida. Hence, another name for the Las Cruces Biological Station is the Wilson Botanical garden. Through their knowledge and hard work, and with financial support from an English patron, the Wilson's established a world-famous garden.

 (Lush tropical vegetation abounds at Las Cruces)

In 1973, the garden became part of the Organization for Tropical Studies (OTS), a nonprofit consortium of universities and research institutions from the US, Costa Rica, Peru, Mexico, South Africa, and Australia. Subsequently, the OTS purchased some nearby forest remnants such that the location has become well-known for its birdlife as well as its plants. 

(Can you guess the common name of this butterfly? How about an 88?!)

The OTS does important work educating the next generation of tropical researchers, and also provides training for teachers and students from all over the world. I have visited all three of the OTS locations in Costa Rica. I am always encouraged when I encounter some of the researchers and students. I am delighted these places exist for their benefit and ours. The work of the OTS is essential if we are to prevent future land use errors and restore some of the mistakes of the past. If you would like to become an "amigo” of OTS, check out their website: http://www.ots.ac.cr.


This post provided by Nic Korte, Grand Valley Audubon Society. Send questions/comments to nkorte1@hotmail.com]To learn more and to participate in the activities of Grand Valley Audubon, please see our website at audubongv.org and “like” us on Facebook!]

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OWLISH ONSLAUGHT

By Nic.Korte
Friday, January 1, 2016

This time of year, until January 5, birders all over the world will be checking out “count circles” to see how many and what birds are present. It is the time of the Audubon Christmas Count. It is a big deal! This is the 116th year. It is an international effort with more than 15 countries hosting counts.

The Grand Valley Christmas Count was conducted on December 20. As you may know, our “count” is famous for the effort invested in counting Western Screech-Owls. This year we had 18 teams out in the pre-dawn. More than 50 people collectively called at ~150 locations to see if the Grand Valley’s little “signature” bird answered.

(This is how you do it at 5:30 AM.)

(Happy Owlers at 7:30 AM)

 

Later in the day, two teams used “cameras-on-a-pole” to look in more than 100 nest boxes within the Grand Valley 15-mile diameter count circle.

Our results were spectacular. We found 86 little owls. This is the second highest number ever reported—only exceeded by the 99 we reported last year. The smaller number this year does not reflect a population change. Owls are mercurial. Last year, they were ridiculously cooperative; answering and zooming in and buzzing the callers. Almost everyone had a “close encounter.” This year, many callers reported distant answers without the owl approaching. Several owls flew in to be seen and not heard. The day-time box checkers found 23 owls hiding in boxes—many in locations where, previous to the count,  the owls had been sitting in their hole all day for everyone to see.

One owl had been sitting in a box in an area much visited by local birders. I had probably seen the owl sitting in the hole 10 times in the previous thirty days—early in the day, late in the day, on cloudy days, and on sunny days. Usually, this box was not on any of the calling routes, but I asked one group to stop and call there, thinking it would save me from needing to stop later in the day. The group responsible for that area dutifully stopped and played their call, but received no response. There was no response at their next stop either. It wasn’t that this group was unskilled or unlucky because they recorded 11 WESOs—the most anyone has ever had on a single route.

Later, my friend Larry and I came by with our camera on the pole. No owl was looking out of the box. So, we used the camera to look inside. There sat the owl. This isn’t the end of that story. My wife and I went for a brief sojourn a few days later-- on Christmas morning during the heaviest part of our unusual snowfall that day. We walked by the box. There sat the owl in the hole with at least an inch of the white stuff on its head. Why didn’t it make it as easy for us on count day? Moreover, there are two other nearby boxes--both empty on count day. Two days after Christmas, all three had an owl.

(These owls are NOT sharing a box. This is a composiste of three boxes located within ~100yds of each other. They are shaing the territory.)


Most route-leaders found fewer owls this year, but two route leaders who had better luck gave me this information: One said, “I think I had good responses because I used the higher-pitched call and played it loud.” The other said, “I think I had a good day because I used the lower pitched call and played it soft.”

I conclude: owls are smarter than I am. I guess if they were more predictable, keeping track of them wouldn’t be so much fun.


This post provided by Nic Korte, Grand Valley Audubon Society. Send questions/comments to audubongv@gmail.com]To learn more and to participate in the activities of Grand Valley Audubon, please see our website at audubongv.org and “like” us on Facebook!]
 

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EAST-WEST (WHAT IS A SPECIES?)

By Nic.Korte
Saturday, December 19, 2015

"East-West" is the name of an excellent French movie released in 1999. The movie depicted a family's travails as they decided to return home to Cold-War Russia after initially escaping to the West during World War II. Unfortunately, the homeland they returned to was not what they expected.

I have lived in the Western US for more than four decades after being born and raised several states to the east. Fortunately, unlike the movie family, when I return "home," folks are happy to see me, and I am free to leave when I am ready. With respect to birds, however, I have found that not all is as I expected.

Recently, my wife and I stopped for a brief walk at the Konza Prairie Preserve (http://kpbs.konza.k-state.edu/) in Eastern Kansas. I spied two familiar birds: a Downy Woodpecker and a White-breasted Nuthatch. The identifications were easy, but the birds didn't look quite right. The Downy seemed to show quite a bit more white on the wings, back and nape. The Nuthatch had a slightly different call, and more black on the crown. It also had an unfamiliar thin, black line behind its eye.

(Rocky Mtn Downy Woodpecker. An eastern bird would have more white on the wings.)

I saw some chickadees too. These Black-capped Chickadees looked and sounded much like those I see and hear in Western Colorado.

The next day, we were in Illinois, southeast of St Louis, Missouri. Once again, I saw some Chickadees. These looked very much like the familiar Black-capped Chickadees--except they are not. These were Carolina Chickadees. Although quite similar in appearance, these were slightly smaller than Black-capped Chickadees. Overall, their appearance was drab and their call slightly different from the very similar Black-capped variety.
(Black-capped Chickadee from Colorado)
East-west differences such as these extend to many familiar species. Western Yellow-rumped Warblers have a yellow throat. Those in the east have a white throat. Even though the east-vs-west difference in these birds is, perhaps, more easily distinguishable than the differences in the chickadees, at least for now, these warblers are considered a single species.

Indeed, the question of "what is a species?" is very much in flux. Originally, species were distinguished solely on looks. Eventually, it was learned that some birds that looked very much alike had different calls and did not interbreed. That seemed easy enough until it was noticed that some birds that didn't look so much alike, hybridized with ease. Now DNA testing is often the principal tool used to separate species. A bird's DNA can determine how long species have been isolated and whether differences are sufficient to justify separating them.

Right now, in general, ornithology is in a "splitting" phase, meaning more species are being split rather than "lumped." It is not a stretch to predict that those Eastern vs Western Downy Woodpeckers and White-breasted Nuthatches might someday be considered separate species. But, if so, how many species? The Nuthatches, in particular, may be split into three species—one for the East, one for the West, and one for the Pacific Northwest.

This is starting to sound very confusing. Consider Colorado's eastern plains where wooded areas, during migration, might simultaneously harbor both Rocky Mountain and eastern varieties of some species. Should you care? Only if you want to. Otherwise, just enjoy the birds, but it is worth realizing, that, like people, some birds might look slightly different. They might have a slight accent, but deep down, also like people, they are mostly the same.


This post provided by Nic Korte, Grand Valley Audubon Society. Send questions/comments to audubongv@gmail.com. [To learn more and to participate in the activities of Grand Valley Audubon, please see our website at audubongv.org and “like” us on Facebook!]
 

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“SEVEN SWANS A SWIMMING”

By Nic.Korte
Monday, December 7, 2015

There are “seven swans a swimming” in Mesa County as I write this. With Christmas on everyone’s minds, the title was a natural. Christmas comes every year, but it is unusual to have so many swans in our local waters. What’s even more exciting is that five of these are Trumpeter Swans. I don’t have all the records, but a quick check indicates Trumpeters have been sighted in Mesa County on less than 20 occasions. The electronic data base, ebird.org, shows only two sightings since 1984. {These swans are at Highline Lake.}

One reason for a lack of reported sightings might be the difficulty of identification. “Oh, come on,” you might say. “Here’s a bird bigger than anything else on the water and it is pure white (if an adult), surely you can identify it!” I wish it were so easy. A few years ago, I was certain I had seen a Trumpeter Swan because the bird’s bill lacked a yellow spot characteristic of most Tundra Swans. I say most because when I returned home and read up on swan identification, I learned that 10% of Tundra swans do not have the yellow spot. LESSON LEARNED: DON’T BASE DIFFICULT IDENTIFICATIONS ON A SINGLE CHARACTERISTIC. I should have looked at the shape of the bill. I should have taken a photo. My camera was right next to me, but I was too excited to photograph the bird until I realized it was taking off.

Take off is quite a sight. For a Trumpeter Swan, becoming airborne requires lumbering across the water for about 100-yards. Trumpeter Swans can be distinguished from Tundra Swans on takeoff, if you know what to look for. It has to do with the neck position, but I was unfamiliar with that characteristic the time I thought I might have seen a Trumpeter. In the end, I had to consider that bird unidentified.

Trumpeter Swans are our biggest native waterfowl, stretching 6 ft in length and weighing more than 25 pounds—about twice the size of a Tundra Swan. If you are thinking, I should be able to tell the two swans apart by size, my response is that size is a notoriously difficult parameter to judge when viewing distant birds on the water. There is also a much greater difference in weight than in length. Tundra swans appear nearly 90% the size of a Trumpeter, so size when viewed at a distance, and without a comparison, is no help.(Two of the Trumpeter Swans at Highline Lake)

Trumpeter Swans are also a major conservation success story. In the 1930’s, there were <100 birds, all in the area of Yellowstone National Park. By 1968, numbers had rebounded to 3,700—by 2010, there were more than 46,000. The Federal Government established a refuge specifically for Trumpeters in Montana. Several state agencies also assisted in the recovery as did a private group, The Trumpeter Swan Society (http://www.trumpeterswansociety.org/). Their combined actions are responsible for the increase in population and the fact that these swans are reclaiming their former home range. A personal example exists in the St Louis, Missouri area, near where I was raised. Trumpeter Swans were unheard of until a few years ago. Now the combination of their population rebound and the establishment of the Riverlands Migratory Bird Sanctuary (http://www.mvs.usace.army.mil/Missions/Recreation/RiversProjectOffice/RiverlandsMigratoryBirdSanctuary.aspx) has resulted in as many as 1000 swans spending the winter just North of St Louis on the Mississippi. Federal funds established the sanctuary which is now managed, in part, by a local Chapter of the Audubon Society. 

Tundra swans are more common, and are typically seen every year here in the Grand Valley, although often they are only present for a few days. As I am writing this, there are two in some ponds near Whitewater and the Gunnison River, which combined with the five trumpeters yield “seven swans a swimming.” The U.S. Fish and Wildlife Service estimates the North American population could be as much as 200,000 with ~100,000 in the eastern population and 60,000 -110,000 in the west. There is even a hunting season for Tundra Swans—which unfortunately, is a risk factor for Trumpeter Swans--as you can imagine from my discussion of the difficulty with identification.

Tundra Swans breed primarily on lakes, ponds and pools situated along river deltas in Alaska and Canada. Breeding birds need large wetlands and lakes with long shorelines that support pondweed. Increasingly, Tundra Swans rely on agricultural fields for subsistence during migration and winter. Hopefully, humans can continue to provide sufficient habitat and care to maintain stable populations of both of our native swans.

This post provided by Nic Korte, Grand Valley Audubon Society. Send questions/comments to audubongv@gmail.com]To learn more and to participate in the activities of Grand Valley Audubon, please see our website at audubongv.org and “like” us on Facebook!]

  

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REPRISE [FOR TIMELINESS]: TURKEYS, FEEDING BIRDS, BUYING FOR CHRISTMAS

By Nic.Korte
Wednesday, November 25, 2015

Honestly, this effort is not evidence of my being lazy or too busy.

At this time of year, certain things are on our minds: turkeys, bird-feeding, and Christmas presents. I decided my blog should be about one of those topics. But, I had already written on those themes. I liked what I wrote, so here, they are again!

TURKEY: The Violent Turkey of the Grand Canyon (http://www.gjsentinel.com/blogs/birds_and_more/entry/not-another-turkey-story ),

WHY WOULD ANYONE (ME?) HAVE SEVEN BIRDFEEDERS? Which one should you have? Which should you buy for a friend?  (http://www.gjsentinel.com/blogs/birds_and_more/entry/adventures-in-bird-feeding),

 

CHRISTMAS PRESENTS FOR NATURE LOVERS (http://www.gjsentinel.com/blogs/birds_and_more/entry/gift-ideas-for-someone-interested-in-birds).

For Christmas, buy your friends Shade-grown coffee, a book about the Birds of Western Colorado, or a membership in Grand Valley Audubon or the Bird Conservancy of the Rockies (http://www.birdconservancy.org/).

 

This post provided by Nic Korte, Grand Valley Audubon Society. Send questions/comments to audubongv@gmail.com]To learn more and to participate in the activities of Grand Valley Audubon, please see our website at audubongv.org and “like” us on Facebook!]
 

3 comments
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