Sunday, 22 January 2023

The Quest For The Rufous-throated Dipper

The east slope of the Andes is one of my favourite places in the world to explore. As I've mentioned before on this blog, this is due to several factors, but prime among them is that this slope receives a high level of rainfall. Turn on the taps, and you turn on the biodiversity. Different plant species grow within particular elevational bands, and these distinctive ecosystems allow other species to flourish. In short, diversity is high and one can access many unique habitats as one travels up or down the eastern slope. 

Laura and I have been, up to this point, in the dry regions east of the Andes, but a few days ago we had our first chance to ascend up the eastern slope of the Andes. The landscape changed dramatically as we drove, starting with dry Chaco scrub for miles, which slowly "greened up" as we headed westwards with the Andes looming beyond. We overnighted near the foot of the mountains in the town of Monteros where we found an excellent little hotel for a very good price. 

January 16, 2023

We followed the tarmac of Highway 307 high into the mountains, with our destination for the evening being the town of Tafí del Valle. Of course, I had a shopping list of most wanted birds for this scenic stretch of road cutting through beautiful forests, with the range-restricted Yellow-striped Brushfinch, White-browed Tapaculo, and Rufous-throated Dipper being the top three.

Quebrada Los Sosa, Tucumán, Argentina

Our first stop was along a nice stretch of continuous yungas forest where right away we found a pair of Plush-crested Jays. While we should bump into this species a fair bit over the upcoming weeks, we were thrilled to find our first. I'm a sucker for a lifer jay, after all. 

Plush-crested Jay - Quebrada Los Sosa, Tucumán, Argentina

We birded up the road for half a kilometre or so before returning to the car. It did not take us long to find our first Yellow-striped Brushfinch; this species ended up being quite common during the day. 

Yellow-striped Brushfinch - Quebrada Los Sosa, Tucumán, Argentina

The Yellow-striped Brushfinch is endemic to northwestern Argentina, where it resides in semi-humid montane forest on the east slope of the Andes. 

Yellow-striped Brushfinch - Quebrada Los Sosa, Tucumán, Argentina

This also was the site of our first (and so far, only) Rufous-browed Warbling Finch. 

Rufous-browed Warbling Finch - Quebrada Los Sosa, Tucumán, Argentina

Birding along Highway 307 was productive, but it wasn't without its challenges. Prime among them was the heavy volume of traffic. At times, transport trucks would blast us with exhaust fumes, their engine noise blocking out all sounds of nature, while a caravan of twenty or more vehicles followed behind. Not the most tranquil birding experience, that is for sure! Laura and I resorted to walking along the elevated stone barriers to minimize the chances of being hit by a vehicle. We just had to be a little careful watching our footwork, so as to not fall off the steep cliffs beside the road!

Birding at Quebrada Los Sosa, Tucumán, Argentina

We stopped periodically at various elevations, getting out to walk stretches of the road. Though the traffic was frustrating, the birding was excellent and we added species such as Yungas Guan, Golden-winged Cacique, Torrent Duck, Slender-billed Woodstar, Tucumán Parrot and more! 

Torrent Duck (male) - Quebrada Los Sosa, Tucumán, Argentina

I contented myself with photographing some of the plants and butterflies alongside the road as well. 

Ludwigia sp. - Quebrada Los Sosa, Tucumán, Argentina

Canna indica - Quebrada Los Sosa, Tucumán, Argentina

Telenassa berenice - Quebrada Los Sosa, Tucumán, Argentina

Whitemouth Dayflower (Commelina erecta) - Quebrada Los Sosa, Tucumán, Argentina

We found a small track leading off of the main highway and enjoyed some temporary relief from the steady stream of traffic. This was a productive stop as we heard our first White-browed Tapaculo alongside the creek. Unfortunately, despite our best efforts, the closest we came to observing it was seeing some branches move. We would still have many more chances at this species the following day, however. We also heard a surprise Red-legged Seriema calling from a partially-cleared area upslope. Definitely not a species we thought we would encounter on a mountain road!

Quebrada Los Sosa, Tucumán, Argentina

The final one of our main targets was the Rufous-throated Dipper. There are only five species in this family of charismatic, river-dwelling birds and Laura and I had seen three up to this point. The American Dipper found in North and Central America, the White-capped Dipper which is widespread in the Andes, and the White-throated Dipper of Eurasia. The only two left were the Brown Dipper of eastern Asia, and the Rufous-throated Dipper, the rarest of the five. It ranges in northwestern Argentina and southern Bolivia and was one of my most-wanted birds for the entire trip. 

Río La Angostura - Quebrada Los Sosa, Tucumán, Argentina

Unfortunately, our dipper quest did not go to plan. We spent the entire afternoon walking alongside visible stretches of the river to no avail. Torrent Ducks were readily available, and we experienced very brief moments of hopefulness when a Black Phoebe perched on a semi-submerged rock. But the dipper remained unaccounted for. 

Scanning for dippers - Quebrada Los Sosa, Tucumán, Argentina

Torrent Duck (female) - Quebrada Los Sosa, Tucumán, Argentina

Torrent Ducks never cease to amaze me with how they thrive in raging mountain rivers. They will dive into rapids quite nonchalantly, popping up effortlessly on the other side. 

Torrent Duck (male) - Quebrada Los Sosa, Tucumán, Argentina

Eventually, we admitted defeat and headed up over the pass towards Tafí del Valle to find a room for the night. Our last new species of the day was a Crested Becard that we watched out of the car window while filling up on gas. That evening, we resolved to return to the upper stretches of the road in the morning, for another crack at the dipper.

January 17, 2023

We retraced our route to the best-looking stretches of river, our focus renewed after a restful sleep. Would this second attempt at the Rufous-throated Dipper be fruitful?

Rufous-bellied Thrush - Quebrada Los Sosa, Tucumán, Argentina

An hour and a half into our search, this did not appear to be the case. I left Laura to keep walking alongside the river, while I fetched the car where we had parked beside a bridge. I made sure to diligently check the river as I walked, in case we had somehow missed a dipper on the first pass. Not surprisingly, I was unsuccessful.

Quebrada Los Sosa, Tucumán, Argentina

Upon returning with the car, I found Laura at a closer point than where I had left her, which seemed strange as the plan had been for her to continue to walk upriver. When she noticed that it was me, however, she frantically pointed down at the river. She had found the dipper!

Rufous-throated Dipper - Quebrada Los Sosa, Tucumán, Argentina

A wave of relief washed over me as I viewed the Rufous-throated Dipper for the first time. It was a dapper little bird, charcoal-gray with a smart rufous throat patch and a crisply contrasting white wing patch. 

Rufous-throated Dipper - Quebrada Los Sosa, Tucumán, Argentina

Laura filled me in on the story. Not five minutes after I departed, she found a dipper and then a second one. She was torn between staying on the birds or running down the highway to fetch me (we had no cell signal here). She opted for the former, which was a good call as she managed to follow one of the dippers downstream until I arrived. What a lucky turn of events! 

Rufous-throated Dipper - Quebrada Los Sosa, Tucumán, Argentina

Even luckier, we had found the dipper with enough time to spare for us to return to the hotel to partake in the included breakfast shortly before that window closed at 9:30. Coffee and a croissant never tasted so good.

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