Tuesday, June 19, 2018
Wednesday, June 13, 2018
I suggested we look for birds in California Gulch, camping one night to see the Buff-collared Nightjars. We had resounding success, even watching one sing at close range in my flashlight's beam.
We also saw Western Screech-Owl and a pair of this tiny yet ferocious looking Elf Owl.
Wednesday, May 23, 2018
Catching up from last October, 2017:
After my Bolivia scout, I flew from Santa Cruz de la Sierra to Porto Velho, the capital of the Brazilian state of Rondônia. If there had been a direct flight between the two major cities, it would have been only about 620 miles, but the grand total of my flights via São Paulo and an overnight layover in Manaus ended up being about 5.3 times farther than that. Such is travel within South America.
I had six days here with my friend Joe Thompson. This was something of a cross between a scouting trip for me and a private tour for him. Joe and I met through our mutual friend Molly in Tucson 14 years earlier, and while both us wanted just a few birds from this region, we were also both interested in learning about the dragonflies and butterflies as well.
Our route took us across the new bridge from Porto Velho to the west side of the Rio Madeira (well, it’s new since I was here last, in 2006). From there we entered the state of Amazonas and took the paved highway north to Humaitá, where a rather nice and new hotel was our home for the next five nights.
Our first stop was on the way to our hotel, and though it was late morning, it was good for insects, if not the best for birds.
One highlight was this dragonlet, Erythrodiplax castanea.
We did come across one of our bird targets, Predicted Antwren, discovered and described to science only a few years ago. It got that name from Bret Whitney, who predicted that a unique species of Herpsilochmus antwren occurred on the west side of the Rio Madeira long before any ornithologists had a chance to explore the area. He was right. Its song is more distinctive than its appearance, as it looks very much like all the other gray, black, and white antwrens in this genus.
Joe’s nearly as interested in the plants as I am, especially if they have fancy flowers like this Aristolochia didyma.
This Bluish-fronted Jacamar was also at our first birding stop.
Another nice dragonfly from here was this king skimmer, Orthemis cultriformis.
A plant I finally recognized only recently from my time at Cristalino was this small tree, Vismia cayennensis, one of the minority of plants in Clusiaceae that isn’t a Clusia.
Getting a bit ahead of myself, I’ll divulge that we did have a chance to stop here early in the morning of our last day, because we missed our most wanted bird this first day. It is known from here and few other sites: The “Campina” subspecies of Azure-naped Jay, also discovered only recently. Some have advocated splitting it as its own species.
We had an amazingly cooperative Fasciated Antshrike low in a small tree, perhaps near its nest.
And two rare seedeaters popped up for us: Dark-throated Seedeater…
…and Copper Seedeater (possibly a first state record).
Over the next four days we visited mostly terra firme forest on the west side of the Rio Madeira by simply taking side roads and tracks off of the main highways west of Humaitá. Thanks to the scouting and eBirding efforts of Brad Davis and Rennó Bruno, who know more about Brazilian birds than almost anyone I know, we had some ideas of where to stop. We didn’t go much farther west than the Ipixuna River, where we had a good time exploring.
He we found what seems to be the first (and very disjunct) state record of Manu Antbird. (I checked only eBird, Xeno-canto, and Wikiaves, so there might be an older published record in the literature.) My recording can be heard here:
We also crossed the Madeira River on a ferry one day, as the forests on the E side of the Madeira here also have some specialties. The ferry leaves every hour on the hour – or even early when it’s full – so it’s impossible to time it perfectly.
We also did a bit of exploring in a patches of savanna-like habitat called campina near Humaitá, where the birds and plants are utterly unlike those in the forest.
Following are just a few of the many highlights from our efforts on these days.
For me, at least as exciting as the specialty birds from the region were the migrants from North America, either arriving for the winter or still on their way south. One of the more unexpected was a Black-whiskered Vireo, a bird I know as a breeding species in Jamaica, but I didn’t get a photo of it. Almost as rarely seen as a migrant in these regions was this Veery. The only other migrant I’ve seen was in Rondônia, less than 200 miles from here and exactly 13 years and one day ago. They probably spend most of the mid-winter months in the Brazilian states of Mato Grosso and Pará and probably also in the neighboring states to the east. (The article to read is “True winter range of the Veery (Catharus fuscescens): lessons for determining winter ranges of species that winter in the tropics” by Van Remsen in the Auk, 2001.)
Away from the northern Andes, Broad-winged Hawk winters sparsely over a huge area, so it’s always a lucky find anywhere in Brazil.
Eastern Wood-Pewee might be just as sparsely spread, but they are more vocal, sitting up in the open, and therefore easier to find.
Then then were the shorebirds, many still on their way south, and we had six species at various roadside ponds. Buff-breasted Sandpiper was probably the most unusual find, with very few records for western Brazil.
The rest of these are a little more regular in the Amazonian region, probably because of their greater overall abundance: White-rumped Sandpiper
Among the regional resident birds, there were the scarce regional specialties, among which we did very well, including Inambari Woodcreeper, Madeira Antwren, Aripuana Antwren, Manicore Warbling-Antbird, and Humaita Antbird.
The best bird we had, as it was not expected and the only one for which we had no recording, was the gnatcatcher. The IOCList has split it as Inambari Gnatcatcher, Polioptila attenboroughi, and my recording is now the only one readily available on Xeno-canto. The SACC hasn’t split it yet, waiting for more published information, but I think everyone already essentially agrees that all the major river-isolated populations in Amazonia behave like separate species. My recording is here:
Among the regular birds that aren’t so range-restricted, the Ocellated Crake we actually saw in one patch of campina was perhaps the most memorable. It has a huge distribution, from Costa Rica to Paraguay, but it has rather specific habitat requirements and is therefore patchy and often very local. It is also one of the hardest rails to see. I had heard it three times before, but had never really seen one. The grass here had burned relatively recently so wasn’t very dense, and I even got some video here:
Then there was the Harpy Eagle, which I first saw fly across the track and then spotted perched in a tree as we were walking down the track known as “Vicinal 14 de Agosto” on the east side of the Rio Madeira. We watched it for a few minutes before it flew off. This was the first time I’ve spotted this super rare megapredator while just walking through the forest. Others have been from canopy towers, boats, or at stake-out nests.
The habitat right along the Madeira didn’t have much access, but there are unique birds here, such as these Tui Parakeets feeding in trees near the ferry.
One day we stopped by a roadside pond where we had this American Pygmy Kingfisher hunting from a fence post.
The Gilded Barbets here were much more richly colored than the ones I know from Peru and Bolivia.
We drove in on one track called the Ramal da Roçadeira, hoping to get to some tall forest. Unfortunately, wherever roads have been made, there has been deforestation.
This pair of Razor-billed Curassows were a surprise in an area that surely has some hunting pressure.
I spotted this Royal Flycatcher nest over a road, and we thought it might be active with a calling bird nearby. Indeed, it had an egg it in.
The Snethlage's Tody-Tyrant here sounds a bit different from ones to the east and might be split in the future, though it currently doesn’t have a name even as a subspecies.
One of the more exciting butterflies was this cycadian hairstreak, Eumaeus toxana. It is rather patchily distributed in Amazonia, wherever its hostplant, a cycad, grows. I searched but did not find any cycads here, but they have to be around.
Among the hairstreaks were this Panthiades boreas…
… and Theritas lisus.
Two of the fancier metalmarks were Adelotypa penthea…
…and Nymphidium omois.
Among the brushfoots were this gorgeous Catonephele numilia…
…and this satyr Cissia myncea.
We had lot of odonates to photograph and later sort through. There has been virtually no collecting done in this region, so there are certainly many undescribed species; and even the described ones aren’t well known or easy to identify. This damselfly will be known only by its genus for some time, Oxystigma sp. Note that not all damselflies close their wings over their back, and several families, like this one, Heteragrionidae, are like our spreadwings in the family Lestidae.
This damselfly appears to be identifiable as Phoenicagrion flammeum.
Even big, showy dragonflies are not well known, such as this clubtail, probably in the genus Phyllogomphoides.
The king-skimmers were well represented here. This one is Orthemis attenuata.
The natural open area of the campina habitat was home to this lovely dragonfly, Ypirangathemis calverti.
The genus Erythrodiplax is in dire need of revision, and several we saw cannot be identified to species. This one seems clearly to be Erythrodiplax anatoidea.
This handsome dragonfly is Diastatops pullata.
Among the other inverts we saw were these stingless bees in the genus Partamona, which built their nest tube into a termite mound.
This long tube on the trunk of a tree turned out to be the silken home of a tarantula, Avicularia rufa.
I had seen a flat bug like this one a few years ago at Cristalino. It is in the family Aradidae.
The internet was able to give me a full name for this longhorn beetle, Hileolaspis auratus.
A new family of bugs for me was Hydrometridae, the water measurers, as the name translates. They are somewhat similar to water striders but have a very different shape when seen up close. These were simply in a rain puddle in the track Vicinal 14 de Agosto.
I took only a few mushroom photos, but this Marasmiellus species on a palm fruit was particularly pretty.
The pond with the most of our shorebirds also had a log full of sunning turtles, Podocnemis unifilis.
One last photo from this side of the Madeira was the regional specialty Saguinus labiatus, Red-chested Moustached Tamarin.
On our last day, after stopping to get the jays, we explored south of Porto Velho, hoping for some east-bank specialties, such as Rondonia Warbling-Antbird, which we did not find, perhaps the time of day being an issue (the other being the lack of pristine forest). But we did find some nice dragonflies and butterflies. One good bird we had in some roadside trees was this Red-billed Pied Tanager.
The fanciest dragonfly we saw was this Zenithoptera lanei.
Its movements were interesting enough for me to get a bit of video:
Another fancy one is this Aeschnosoma forcipula, one of the few tropical members of the mostly temperate zone Emerald family, Corduliidae
We had another Orthemis attenuata on this side of the river as well.
It was quite surprising how many metalmarks we had in this area. Below are five species, starting with this Echenais thelephus.
One brushfoot I thought worth sharing was this leafwing Zaretis isidora, which I caught with my hands.
Joe’s flight home was later this final evening, and mine followed the next morning onward to my next scouting leg in northeastern Brazil. Here’s a final photo of us with Tomás Schmitz, the very capable driver and ground agent who put all of our reservations together. Tomás’ parents founded the well-known Rancho Grande, one of Brazil’s first eco-lodges near the town of Caucaulândia, Rondônia, just as mass deforestation was beginning in the state. His sister now runs the place, and their two forest patches are among the largest remaining in the region. I spent some wonderful days here in 2004 and 2006.