Sunday, January 10, 2016

SE Peru From the Field Report 1

October 17, 2015

Black-and-chestnut Eagle

The first half of our Manu Biosphere Reserve tour has been so full of amazing bird sightings it was like a tour all in its own. In the past six days we’ve descended the moist slope of the Andes from Acjanaco Pass to Villa Carmen Biological Station (with some light rain just part of one morning, much less than expected) and are soon heading out by boat down the Madre de Dios River to the lowlands where the diversity is supposed to increase. But that’s hard to believe. We’ve already seen over 350 species of birds in less than a week.

At the highest elevations a couple of tanager flocks finally appeared with gorgeous Grass-green, Golden-collared, and Scarlet-bellied Mountain-Tanagers showing well, as well as a very cooperative Black-throated Tody-Tyrant.
Black-throated Tody-Tyrant

Close fly-bys of two female Swallow-tailed Nightjars, a tantalizingly close calling Rufous-banded Owl, and roosting Chestnut-collared Swifts were highlights from a short evening walk. My attempts to rile hummingbirds with Yungas Pygmy-Owl imitations resulted in a the real thing responding and flying in. But instead of keeping hidden in a tree high above our heads as they often do, this one landed amongst the lichens, bromeliads, and orchids in the trees below eye level on the downslope side of the road where we had excellent views.
Yungas Pygmy-Owl

At this same elevation I was surprised to see a colorful little grass skipper. It was interesting enough that I made the uninterested group wait in the bus while I got a photo for an ID. It is Vettius coryna.
Vettius coryna

Vettius coryna

We had a good experience watching some very active Andean Cock-of-the-rocks on their lek, one bird being particularly bold by performing his head-bowing display on a branch right in front of us.
Andean Cock-of-the-rock

The feeders at our mid-elevation lodges of San Pedro had nice Booted Racket-tails, Many-spotted Hummingbirds, and Violet-fronted Brilliants, but it was a resident Wedge-billed Hummingbird that fed from the pink Heliconia flowers in the garden that stole the show.
Wedge-billed Hummingbird

Other birds in the garden were gorgeous Silver-beaked Tanager in rich light and a pair of bold Andean Motmots (two of several that we saw) that came to feed on bananas.
Andean Motmot

Perhaps the most astonishing and thrilling sighting from the mid-elevations was a juvenile Black-and-chestnut Eagle that our van flushed from a low log on the side of the road. The monster flapped slowly in front of us as we came to a sudden stop, and it perched not 10 yards from the road. A passing car threatened to flush it before we got photos, but the bird remained nonplussed, proceeded to preen, and the driver of the passing car even paused to point his camera phone out the window.
Black-and-chestnut Eagle

On our way to the lower Kosñipata Valley we saw yet more great birds. Cinnamon-faced Tyrannulets foraged at eye-level, a pair of Wattled Guans surprised us in trees next to the road, and a stationary Lanceolated Monklet perched in the open but far from obvious was brilliantly spotted by one of the participants. The butterflies were out of this world. Some of the showier and more colorful were the clear-winged metalmark Chorinea sylphina and the shocking Fountainea nessus, Superb Leafwing, wings spread below a bridge over a small stream.
Chorinea sylphina

Fountainea nessus, Superb Leafwing

The birds of the bamboo thickets here at Villa Carmen Biological Station were amazingly cooperative. While standing in one spot just a ten-minute walk from our rooms we saw Bamboo Antshrike and Yellow-breasted Warbling-, Goeldi’s, White-lined, and Manu Antbirds. White-cheeked Tody-Flycatcher was in another bamboo thicket as well, and we ended that first day with over 130 species. Even closer to our rooms was a family group of the most unlikely of the world’s birds, the Hoatzin, and at the same marsh we enjoyed a tail-wagging, head-bowing, and sac-inflating performance from a pair of Black-capped Donacobius. The overnight thunderstorm and yesterday morning’s continuing sprinkles produced a termite emergence that resulted in an explosion of bird activity such as a flock of a dozen flycatching Purple Honeycreepers and three male Plum-throated Cotingas perched in some treetops. We then watched a non-swarming column of army ants (the orange-bodied Eciton rapax) with a kleptoparasitic silverfish living amongst them. These ants were running quite fast in a narrow column across our trail, back and forth from their nest and whosever nest their were raiding, and we noticed a couple of these interlopers running right alongside the ants. They were even a bit faster than them, rubbing shoulders and not being attacked. It turns out they camouflage themselves with the ants' own odors while sneaking meals right out from under the ants' noses.
Eciton rapax

Eciton rapax and kleptoparasitic silverfish

kleptoparasitic silverfish

Later in the afternoon a great surprise and first local record was an Upland Sandpiper in a newly planted field in the agricultural plots that are part of the station’s involvement in helping the communities of the region develop sustainable farming methods.
Upland Sandpiper

We missed seeing the adult Common Potoo that had been on a nest, but in its place instead was the most adorable half-grown chick roosting on its own, trying its best to look like a tree trunk.
Common Potoo

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