Ivory-billed Woodpeckers in the Pearl River Swamp
In April 2005, the most exciting news in the history of conservation came from Arkansas, where a team led by Cornell University
had a series of Ivory-billed Woodpecker sightings. There had been many sightings since the 1940s, including David Kulivan’s report of a pair in the Pearl River
along the southern border between Louisiana and Mississippi in 1999, but they usually lacked evidence or follow-up sightings to back them up. The extreme wariness of the Arkansas bird suggested that populations of Ivory-billed Woodpeckers could be hiding out in other southern swamp forests. The news from Arkansas motivated successful searches in the Choctawhatchee River in Florida
(led by Auburn University) and in the Pearl River (documented at this website).
Having heard ‘kent’ calls on the Mississippi side of the Pearl River in February 2000, where unusual bark scaling was discovered several years later, I knew that Kulivan’s report was legitimate. Between November 2005 and June 2013, I spent several months per year searching for Ivory-billed Woodpeckers in the Pearl River. During a five day period in February 2006, I had five sightings, heard kents on two occasions (once coming from two directions at the same time), and obtained video footage of a large woodpecker that has several characteristics that are consistent with an Ivory-billed Woodpecker but not a Pileated Woodpecker. In March 2008, I obtained
video footage during a sighting a short distance up the same bayou. In January 2007, I obtained
video footage in the Choctawhatchee River during an encounter with a pair of Ivory-billed Woodpeckers while participating with Geoff Hill’s search team in a follow up to a sighting the previous day. The videos contain the strongest evidence for the persistence of the Ivory-billed Woodpecker that has been obtained during the past several decades. They are discussed in this paper (which includes supplemental material),
this preprint, and
these lectures. The movies in
this playlist contain footage that was obtained from a drone over the Pearl, Choctawhatchee, and Apalachicola Rivers. The movies in
this playlist contain footage that was obtained while hiking, kayaking, and climbing trees in the Pearl River.
Daily logs are available for the 2006,
2011, 2012, and
2013 search seasons and for
visits after 2013. Most of the searching involved kayaking and hiking through southern swamp forests, but I spent some time observing from tall cypresses that
provide unobstructed views over the treetops. I had nine sightings in Louisiana (2-2-06, 2-16-06, three on 2-17-06, 2-20-06, 3-10-06, 2-16-08, 3-29-08) and one sighting in Florida (1-19-07). I heard kents twice in Louisiana (2-16-06, 2-18-06). Two of the encounters (2-18-06, 1-19-07) involved two birds. Michael DiGiorgio painted Ivory-billed Woodpeckers into photographs in order to bring to life some of my best sightings. Some of my favorite photos from the Pearl River have been converted into artwork. An artist has produced cartoons based on the Ivory-billed Woodpecker’s ability to frustrate bird watchers and
supposed need for old growth forest.
Alaska Sea Trip - Fall 2016
I am participating in a sea trip in the Arctic. Photos and videos will be posted
here. I may not be able to upload videos until after the trip (middle of November).
Norway Sea Trip - Winter 2014
During the winter of 2014, I participated in a sea trip off the coast of Norway. As shown on this map, the trip began in Ålesund on February 18 and ended in Tromsø on March 9. Most of the trip was above the Arctic Circle, including several days above the northernmost tip of Norway up to nearly 72° N. Only a few people went ashore during a brief stop at Honningsvåg, but it was interesting to see that town from the ship. Although the purpose of trip wasn’t to see birds, we visited biologically rich areas with lots of birds. During my free time, I obtained lots of photos and video footage. The videos may also be accessed in this playlist on YouTube. The conditions weren’t always favorable — the ship was often moving at over 10 knots, the birds were often far from the ship, the seas were often rough, the light conditions were often poor, and the lenses were often wet — but I hope others will enjoy the scenery and birds in areas that aren’t visited by bird watchers very often. The video was obtained using bino-cam, which consists of a video camera mounted on binoculars. The binoculars provide a much better image than the viewfinder and make it much easier to get the camera on a bird. I saw a gull that seemed different from all of the common species that were seen regularly during the trip and suspected it was an Ivory Gull while watching it through the binoculars. In the video, it appears all white and has tern-like flaps that are consistent with Ivory Gull. It was exciting to see flocks of alcids with stunning Arctic scenery in the background. I never got tired of watching fulmars in flight. The northern lights were indescribably amazing on some nights, with some of the glowing green arcs passing directly above and extending from one horizon to the other.
Solving Puzzles with Group Theory
I didn’t have much interest in Rubik’s Cube when it first came out, but then it occurred to me that it’s a fascinating application of group theory. It was 1982, and I had recently been introduced to that topic in an algebra class at MIT. It didn’t take long to figure out how to solve it using commutators, conjugates, and the cycle notation. I was hoping that someone would generalize it to the dodecahedron. Such a puzzle, which is known as the Megaminx (shown above), was already available at the time, but I didn’t find out about it until decades later. I have posted a lecture on
solving puzzles using group theory. FORTRAN codes for solving these puzzles on the screen are available for download.
Cruise to Alaska - May 2014
During the last week of May 2014, I obtained lots of photos and video footage during a sea cruise from Seattle to Alaska with Holland America.
The videos may also be accessed in this playlist on YouTube. I saw lots of seabirds during the transit from Seattle to Juneau, including several Black-footed Albatrosses, lots of Leach’s Storm Petrels, a few Fork-tailed Storm Petrels, several unidentified Shearwaters (some with white underwings and some with dark underwings), and many alcids. I saw lots of whales and other sea mammals at various points during the trip. My favorite part of the trip was going up Mt. Roberts in Juneau and seeing Rock Ptarmigans. I was expecting the ptarmigans to be in breeding plumage and was initially taken aback by the stunning white plumage. I heard one of them calling and the video shows the field marks well enough for positive identification. I was amazed by the flight and rapid bursts of wingbeats of that species. It was difficult to track a pair through the viewfinder of the video camera as they passed in front of patches of snow during a meandering flight. There was an amusing photo-bombing by a Bald Eagle during the filming of a singing Fox Sparrow. I was blown away by the beauty of Glacier Bay. It was the first time I was able to really study the Arctic Tern. I was amused to see a Black-legged Kittiwake resting on a small iceberg.
1000 Islands - August 2015
In August 2015, I took a cruise out of Kingston, Ontario, that
sailed through the 1000 Islands and made stops at Upper Canada Village,
the observation tower near the international bridge, and
other locations. Some photos are posted
Arizona - June 2015
During a visit to Arizona, I spent a day each in the Chiricahua and Huachuca Mountains in
the southeastern corner of the state and also visited Monument Valley and
Petrified Forest National Park. Some photos of the
gorgeous scenery are posted here. I had a bit of an adventure during a hike around Carr Peak. On the
way up a steep trail to Bear Saddle, I got severe cramps in my thighs and had to use up most of my fluids in order to stop them. I was
beyond the half-way point of the hike and decided to keep going. When the trail got steeper and the cramps returned, I decided to turn
back. The trail ahead was uncertain, and I knew there was a stream with water on the way back. I wouldn’t have
made it out of there if not for that stream.
Colorado - June 2014
I spent several days in Colorado at the end of June 2014. I obtained photos and video footage of flowers and the glass artwork of Dale Chihuly at the Denver Botanical Gardens and of wildflowers, wildlife, and scenery in the mountains in Golden Gate Canyon State Park and Rocky Mountain National Park.
Bird Watching Trip Reports
Photos from Manu National Park: Peruvian Amazon
Iguazu Falls: Near the Argentina, Brazil, Paraguay border
Photos from the Four Corners area
Photos from Big Bend National Park
Photos from Yellowstone National Park
Favorite Photo: Rio Marañon (a branch of the Amazon) near Balsas, Peru
Wakefield Park: A Hotspot for Mourning and Connecticut Warblers
Venus transits the Sun (June 8, 2004)