News - November 2012

Tawny-crowned Pygmy-Tyrant
Euscarthmus meloryphus
Barullero/Tawny-crowned Pygmy-Tyrant© C y T Di Mauro
Green-backed Woodpecker
Colaptes melanochloros
Carpintero real/Green-backed WoodpeckerMale and female © Milano-Muszkats
Guira Cuckoo
Guira guira
Pirincho/Guira CuckooI'm off to the Viamonte Grill! © viagra see what it does C y T Di Mauro Pirincho/Guira CuckooWhat a tasty morsel I've got! © C y T Di Mauro
Pirincho/Guira CuckooIt seems sweetbread © C y T Di Mauro Pirincho/Guira Cuckooor is it thin skirt? © C y T Di Mauro



Spectacled Tyrant
Hymenops perspicillatus
Pico de PlataM/Spectacled TyrantMMale © Milano-Muzskats
Spectacled Tyrant
Hymenops perspicillatus
Pico de PlataH/Spectacled TyrantFFemale © Milano-Muszkats
Glittering-bellied Emerald
Chlorostilbon aureoventris
Picaflor comúnM/Glittering-bellied EmeraldM© C y T Di Mauro


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Rufous Hornero
Furnarius rufus
Hornero/Rufous Hornero© C y T Di Mauro Hornero/Rufous Hornero© C y T Di Mauro
Hornero/Rufous Hornero© C y T Di Mauro Hornero/Rufous Hornero© C y T Di Mauro
Hornero/Rufous Hornero© C y T Di Mauro Hornero/Rufous Hornero© C y T Di Mauro
This Hornero built the nest before getting to the antenna towards the Middle Path, Flew to and from the nest many times carrying food for the chicks
Checkered Woodpecker
Veniliornis mixtus
Carpintero bataraz chicoR/Checkered WoodpeckerBThe nest © C y T Di Mauro Carpintero bataraz chicoR/Checkered WoodpeckerBThe owner of the nest © C y T Di Mauro
Carpintero bataraz chicoR/Checkered WoodpeckerBWith food for the chicks © C y T Di Mauro Carpintero bataraz chicoR/Checkered WoodpeckerBGoing into the nest © C y T Di Mauro
Carpintero bataraz chicoR/Checkered WoodpeckerBThe chick can barely be seen © C y T Di Mauro Carpintero bataraz chicoR/Checkered WoodpeckerB© C y T Di Mauro
Carpintero bataraz chicoR/Checkered WoodpeckerBAlmost inside © C y T Di Mauro Carpintero bataraz chicoR/Checkered WoodpeckerBGoing out again © C y T Di Mauro
Carpintero bataraz chicoR/Checkered WoodpeckerBWith another piece © C y T Di Mauro Carpintero bataraz chicoR/Checkered WoodpeckerBTo fetch some more © C y T Di Mauro
Rufous-sided Crake
Laterallus melanophaius
Burrito común/Rufous-sided Crake© C y T Di Mauro Burrito común/Rufous-sided Crake© C y T Di Mauro
We saw the chicks but could not photograph them because it quickly hid them. They are in the Gull Pond, on the Lizard Path approximately 200 metres away from the Middle Path. CyT See L10 on map
Tropical Kingbird
Tyrannus melancholicus
Suirirí real/Tropical Kingbird© J Simón Tagtachian
Brown-chested Martin
Progne tapera
Golondrina parda/Brown-chested Martin© J Simón Tagtachian
Glittering-bellied Emerald
Chlorostilbon aureoventris
Picaflor comúnM/Glittering-bellied EmeraldMMale © J Simón Tagtachian
Sooty-fronted Spinetail
Synallaxis frontalis
Pijuí frente gris/Sooty-fronted Spinetail© J Simón Tagtachian
Warbling Doradito
Pseudocolopteryx flaviventris
Doradito común/Warbling Doradito© Pablo Mosto
Dark-billed Cuckoo
Coccyzus melacoryphus
Cuclillo canela/Dark-billed Cuckoo© Pablo Mosto



Benteveo rayado
Myiodynastes maculatus
Benteveo rayado/Streaked Flycatcher© Carlos Gonzalez Ledo

The Streaked Flycatcher is a migrant bird which nests in costanera. Every year they fly back and forth from northern South America to Argentina. It breeds here and goes back north to spend the austral winter. Out of the seven recognized subspecies of Streaked Flycatcher,
Myiodynastes maculatus solitarius is the one that migrates to Argentina.

Year after year we can count on this flycatcher. They stay from October to March approximately. As they arrive they have to establish their territory. They make a lot of fuss when they chase each other with rapid flights manouvering among trees and singing loudly. It is difficult to follow the scene since they get out of sight easily. They also compete against other species for holes in trees, like those of woodpeckers', where they will nest. CR



It rains under the rosewoods
(Tipuana tipu)
When November comes and rosewoods become green again an unusual phenomenon is witnessed for only a couple of weeks - it rains under the rosewoods no matter if it is a sunny or cloudy day. This is caused by an insect, the spittlebug, whose nymph feeds on this tree's sap. The nymph produces a spittle mass around the stalks which is a good cover against predators and keeps it moist. The foam is the waste product eliminated after sap nutrients have been absorbed, into which air bubbles are introduced through a breathing tube which is at the end of the abdomen of the nymph.
Chicharrita de la espuma/Spittlebug© Carlos Gonzlez Ledo Nymphs are under the foam Chicharrita de la espuma/Spittlebug© Roberto Ares I came across it when I enlarged the photo © Roberto Ares
When the spittle masses become too heave they disintegrate into drops. This is known as "the weeping of the rosewoods". If dripping is intense puddles are formed on the ground.
Chicharrita de la espuma/Spittlebug© Roberto Ares Chicharrita de la espuma/Spittlebug© Cora Rimoldi
This phenomenon may be experienced under the rosewoods planted on the streets. But this phenomenon may well pass unnoticed since "the weeding of the rosewoods" is confused with "the weeping of the balconies".
Two exotics Estornino pinto-mora/Sturnus vulgaris-mulberry Man has always moved with his culture on his back throughout history. For whatever reason: cultural nostalgia, economic reasons, deliberately or accidentally the introduction of plant and animals has caused in the receiving environment an unequal struggle. The exotics have no their natural predators which control the spread of the population to such an extent that they grow out of control and become pests. This caused the regression of the autoctonous flora and fauna and became a call to attention, which has lead the Government to legislate on the protection and conservation of native flora and fauna. Nevertheless, fulfilment of the law is still not a priority.

In this photo two introduced species: the European Starling
Sturnus vulgaris with a fruit of the Mulberry Tree
Morus nigra in its bill. This tree is native to Eurasia. Its fruit is fleshy and purple and is highly appreciated by birds which disseminate the seeds. In the reserve this tree has easily spread. The first records of the European Starling in Buenos Aires date back to the late ’80. According to investigations it has expanded along the coast of the Province of Buenos Aires till Mar del Tuyú. At Costanera this is a resident bird and its presence was first recorded in 1997 as Germán Pugnali points out. It is very aggressive: it pushes native birds or migratory birds in their competence for food and nests. It is opportunistic: it makes do with anything it can get. It has a high rate of reproduction: it would almost double their population yearly.

The negative impact this bird caused at an economic an ecological level in other countries where it was also introduced have been broadly investigated. We must learn from this to avoid this situation. Population growth is so fast that it becomes imperative to take measures to erradicate this species before it is too late. CR
New bird species: White-throated Hummingbird
Leucochloris albicollis
Picaflor garganta blanca/White-throated HummingbirdSee more photos © J. Simón Tagtachian
Brazilian Duck
Amazonetta brasiliensis
Pato cutirí/Brazilian DuckFemale © J. Simón Tagtachian Pato cutirí/Brazilian DuckPair © J. Simón Tagtachian
Black-and-rufous Warbling-Finch
Poospiza nigrorufa
SietevestidosJ/Black-and-rufous Warbling-FinchJJuvenile © Carlos Gonzalez Ledo
Speckled Teal
Anas flavirostris
Pato barcino/Speckled TealAn there was another pair nearby © Carlos Gonzalez Ledo
Bran-colored Flycatcher
Myiophobus fasciatus
Mosqueta estriada/Bran-colored Flycatcher© Carlos Gonzalez Ledo
Goblet flower
Cypella herbertii
Lirio del bajo/Goblet flower© Carlos Gonzalez Ledo
Visit to the Raptor Rehabilitation Center
Águila coronada/Crowned EagleCrowned Eagle
Harpyhaliaetus coronatus © Carlos Gonzalez Ledo
Taguató común anillado/Ringed Roadside HawkRinged juvenile Roadside Hawk
Buteo magnirostris © Jesús Fernández
Learn the activities of this center. Read interview with Andrés Capdevielle who is in charge of the Raptor Rehabilitation Center in the reserve
Masked Gnatcatcher
Polioptila dumicola
Tacuarita azulMMasked GnatcatcherMEvery year we can find them nesting. The male is incubating. © Claudia y Tito Di Mauro
Small-billed Elaenia
Elaenia parvirostris
Fiofío pico corto/Small-billed Elaenia© Claudia y Tito Di Mauro
Red-eyed Vireo
Vireo olivaceous
Chiví común/Red-eyed Vireo© Claudia y Tito Di Mauro
Hornero
Furnarius rufus
Hornero/Rufous HorneroVery badly hurt on the head but alive and kicking © Claudia y Tito Di Mauro
Bay-winged Cowbird
Agelaioides badius
Tordo músico/Bay-winged CowbirdWelcoming visitors © Claudia y Tito Di Mauro
Rufous-collared Sparrow
Zonotrichia capensis
Chingolo/Rufous-collared Sparrow© Claudia y Tito Di Mauro
White-winged Becard
Pachyramphus polychopterus
Anambé comúnM/White-winged BecardM Anambé comúnM/White-winged BecardMIt seems this male doesn't like juicy mullberries. It crushes one after the other against the branch forcing juice out. © J Simón Tagtachian
European Starling
Sturnus vulgaris
Estornino pinto/European StarlingA white starling has been in the reserve for several years now. Will it be the same? © J Simón Tagtachian
Monk Parakeet
Myiopsitta monachus
Cotorra/Monk Parakeet© J Simón Tagtachian