| Golondrina parda Progne tapera |
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| Fotos © J. Simón Tagtachian
Two martin fledgelings wait for their parents to bring some food. A fledgeling is a young bird which has left the nest. It is feathered but is still cared for by the parents. An evident characteristic is the enlarged oral flanges at the base of the bill. This structure is enlarged integumentary tissue which passerine chicks have when they hatch and decreases as the young grows. It is normally yellow and it will be more or less bright depending on how well lit the nest is. It is believed to arouse parents to feed the young and to serve as a food target to place it properly. The other detail is the colour of these juveniles. They are grayish compared to the adult which is brown. |
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| New Butterfly species: Ivory Eunica eburnea |
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 © Silvia Vitale |
 © Silvia Vitale |
| Many-colored Rush-Tyrant Tachuris rubigastra |
 © J. Simón Tagtachian |
| White-lined Tanager Tachyphonus rufus |
 Juvenile male© Paula Milano y Juan Pablo Muszkats |
Camponotus mus Camponotus mus is black and has short, erect hairs covering all the body. Its abdomen has longer and flattened hairs, which give it a golden colouring. Carpenter ants do not consume wood. They collet sucrose solutions from plants and aphids. |
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The mound of sawdust was not fortuitous. This was part of the material removed by these ants which were hollowing out the trunk of this live tree. The rest was scattered on the ground. As long as we stayed there they kept dumping material continuously. They emerged out of the hole, reached the edge, emptied the load and went back. Sawdust was of different sizes, sometimes as long as the ant itself. We put a finger near one of them to have a size reference point. It stayed montionless and showed no aggressiveness. Neither were they aggressive when the earwing passed by. Nevertheless the visit of a wasp did not pass unnoticed. Unluckily the action was not filmed, but the ants near the scene attacked the wasp in unison. The day before a wasp had been laying eggs in the surroundings. Video © Roberto Ares – Texto: Cora Rimoldi |
| New Butterfly species: Arawacus ellida | |
 © Roberto Ares |
 © Roberto Ares |
| New Butterfly species: Big Lazy Actinote pyrrha |
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 © J. Simón Tagtachian |
 © J. Simón Tagtachian |
| Burst of butterflies at RECS |
 1 – Southern Buckeye Junonia genoveva hilaris2 – Fiery Skipper Hylephila phyleus 3 – Claudina Crescent Tegosa claudina 4 – Bella Mapwing Hypanartia bella 5 – Southern Fritillary Euptoieta hortensia 6 – Gulf Fritillary Agraulis vanillae maculosa 7 – Common Lazy Actinote pellenea 8 – Common White-milk Tatochila autodice 9 – Big Lazy Actinote pyrrha 10 – American White-milk Tatochila mercedis vanvolxemii 11 – Southern Monarch Danaus plexippus erippus 12 – Lesbia Sulfur var. heliceoides Colias lesbia 13 – Lyssipoides Metalmark Riodina lyssipoides 14 – Lesbia Sulfur Colias lesbia 15 – Celmis Satyr Ypthimoides celmis 16 – Caulonia Groundstreak Calycopis caulonia 17 – Argentine Checkered Skipper Pyrgus orcynoides © JST (J. Simón Tagtachian) – © RU (Rosana Ursino) |
| Limpkin Aramus guarauna |
 © Pablo Serur |
| American Kestrel Falco sparverius |
 © Pablo Serur |
| Many-colored Rush-Tyrant Tachuris rubigastra |
 Juvenile© Pablo Serur |
| Black-capped Warbling-Finch Poospiza melanoleuca |
 © Pablo Mosto |
| Blue-billed Black-Tyrant Knipolegus cyanirostris |
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 Female (photo taken in February)© Paula Milano – Juan Pablo Muszkats |
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| Camuati Wasp Polybia scutellaris There is an action between two camuatis which is solved by means of circular figures accompanied by vigorous wing beating. Communicational or confrontational act? Video © Roberto Ares – Text: Cora Rimoldi |
| White-faced Ibis Plegadis chihi |
 © Pablo Serur |
| More juveniles | |
| Harris’s Hawk Parabuteo unicinctus |
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 © Pablo Serur |
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| Rusty-collared Seedeater Sporophila collaris |
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 © Pablo Serur |
 © Pablo Serur |
| Checkered Woodpecker Veniliornis mixtus |
 Nest currently under construction© Rosana Ursino |
| Fawn-breasted Tanager Pipraeidea melanonota |
 And now an adult© Pablo Mosto |
| Getting ready to leave | |
| Brown-chested Martin Progne tapera |
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 © J. Simón Tagtachian |
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| White-winged Becard Pachyramphus polychopterus  Female© J. Simón Tagtachian |
White-winged Becard Pachyramphus polychopterus  Male© J. Simón Tagtachian |
| Juveniles | |
| Blue-and-yellow Tanager Thraupis bonariensis  © J. Simón Tagtachian |
Roadside Hawk Buteo magnirostris  © J. Simón Tagtachian |
| Glittering-bellied Emerald Chlorostilbon aureoventris  © J. Simón Tagtachian |
Rufescent Tiger-Heron Tigrisoma lineatum  © J. Simón Tagtachian |
| Great Kiskadee Pitangus sulphuratus  © Carlos Gonzalez Ledo |
Neotropic Cormorant Phalacrocorax brasilianus  © Carlos Gonzalez Ledo |
| Spot-flanked Gallinule Gallinula melanops  Adulto con dos crías muy pequeñas.© Claudia y Tito Di Mauro |
Spot-flanked Gallinule Gallinula melanops  Juvenil© Claudia y Tito Di Mauro |
| Striated Heron Butorides striatus  © Carlos Gonzalez Ledo |
Rufescent Tiger-Heron Tigrisoma lineatum  © Carlos Gonzalez Ledo |
| Masked Duck Nomonyx dominica  Female© Claudia Furman |
Tropical Kingbird Tyrannus melancholicus  First Kingbird photographed in the reserve© Claudia Furman |
| Vermilion Flycatcher Pyrocephalus rubinus  Male© Carlos Gonzalez Ledo |
Solitary Cacique Procacicus solitarius  The same technique with an unusual meal. It inserts the bill and opens it to tear the piece of bread apart.© Roberto Ares |
| Scarlet-headed Blackbird Amblyramphus holosericeus  © Claudia y Tito Di Mauro |
White-faced Whistling-Duck Dendrocygna viduata  Two structural characteristics of sievers can be identified in the bill of this White-faced Whistling-Duck. A flared maxilla at the tip and a highly developed nail. Sievers feed separating food particles from the water. The lamellae, thin plates which line the edges of the bill, function like a strainer. They let water out and retain material food.© José Luis Merlo |
| Spot-flanked Gallinule Gallinula melanops  Courtship display: The female stimulates the male showing receptiveness. With the back arched, the rigid wings a bit raised as if touching the tips at the back and the head lowered. The male perceives the female´s disposition and follows her.They engage in a merry-go-round movement and after three turns the female stops to be mounted. © Roberto Ares |
Spot-flanked Gallinule Gallinula melanops  The female does not dip the head into the water. As the action is finished the female goes away with a wing shuffling. The male makes a bow display arching his body and lowering the head.© Roberto Ares |
| Fulvous Whistling-Duck Dendrocygna bicolor  Unluckily the scene was captured once it had begun and it was not possible to document the existence of courtship displays prior to mating. During mating the female remains under water and the male holds her by the head. After copulation both celebrate with a short but vigorous water treading as they rise parallel sticking their chests out and keeping their half-folded wings raised.© Roberto Ares |
Rufescent Tiger-Heron Tigrisoma lineatum  Three chicks in three different sizes. This is because Tiger-Herons, unlike most bird species, begin to incubate immediately after the egg is laid. Since the eggs take the same number of days to develop they hatch staggeredly. This is known as asynchronous hatching and accounts for the difference in size. The oldest chick is almost a month old.© Claudia y Tito Di Mauro |
| Red-crested Cardinal Paroaria coronata  In nest© Claudia y Tito Di Mauro |
Red-gartered Coot Fulica armillata  Feeding the chicks© José Luis Merlo |
| Gray-breasted Martin Progne chalybea  Gray-breasted Martins have arrived …© Roberto Ares |
Gray-breasted Martin Progne chalybea  …and packed the antenna, the meeting place.© Roberto Ares |
| Southern Lapwing Vanellus chilensis  We did not spot the nest but here is the proof. One of the two chicks, very well camouflaged, under the adult’s supervision.© Roberto Ares |
Rufescent Tiger-Heron Tigrisoma lineatum  Following the development of the heron chicks. They are three weeks old.© Carlos Gonzalez Ledo |
| Lake Duck Nomonyx dominica  Male© Roberto Ares |
Glittering-bellied Emerald Chlorostilbon aureoventris  Male© Carlos Gonzalez Ledo |
| Rufous-sided Crake Laterallus melanophaius  © Jorge García Vicente |
Vermilion Flycatcher Pyrocephalus rubinus  First Vermilion Flycatcher of the season?© Carlos Gonzalez Ledo |
| Rufescent-Tiger Heron Tigrisoma lineatum  Rufescent-Tiger Heron sitting on eggs.© Carlos Gonzalez Ledo |
Rufescent-Tiger Heron-juvenile Tigrisoma lineatum  Wandering very near the nest.© Carlos Gonzalez Ledo |
| Chalk-browed Mockingbird Mimus saturninus  Melanistic bird. Conspicuous darkening on the face and the wings. This abnormal colouration is due to an excess of melanin.© Mirta Ragonesi |
Black-necked Swan with chick Cygnus melancoryphus  Adult swans often carry their chicks on their back.Chicks get on board by anchoring their head to the adult´s body and use their legs to crawl up to a safe place. © Mirta Ragonesi |
| Yellow-browed Tyrant Satrapa icterophrys  © Carlos Gonzalez Ledo |
Red-gartered Coot Fulica armillata  Mating© Mirta Ragonesi |
| Orange-backed Troupial Icterus croconotus  © Carlos Gonzalez Ledo |
Scarlet-headed Blackbird Amblyramphus holosericeus  Juvenile and adult© Jorge García Vicente |
| Sayaca Tanager Thraupis sayaca  © Carlos Gonzalez Ledo |
Green-winged Saltator Saltator similis  © Carlos Gonzalez Ledo |
| Paloma picazuró Columba picazuro  This Picazuro shows the precision and exactitude for a controlled landing.Vertical position with open wings and spread tail for braking. Forwardly extended legs for the final phase: impact against the branch. © José Luis Merlo |
New births © Roberto Ares |
| Gavilán mixto Parabuteo unicinctus  © Mirta Ragonesi |
| New species: Crested Doradito Pseudocolopetryx sclateri  © Carlos Gonzalez Ledo |
Scarlet-headed Blackbird Amblyramphus holosericeus  Juvenile© Claudia Furman |
| Long-tailed Reed-Finch Donacospiza albifrons  © Jorge García Vicente |
Roadside Hawk Buteo magnirostris  © Mirta Ragonesi |
| Rufous-bellied Thrush Turdus rufiventris  Leucism on external rectrix.© Jorge García Vicente |
Saffron Yellow-Finch Sicalis flaveola  Male and Female© Mirta Ragonesi |
| Ultramarine Grosbeak Cyanocompsa brisonii  © José Luis Merlo |
Yellow-billed Cardinal Paroaria capitata  © José Luis Merlo |
| Rufous Hornero Furnarius rufus  Three stages in the construction of the oven with a week difference. The partition wall is still to be built.© Carlos Gonzalez Ledo |
Rufous Hornero Furnarius rufus  Note there is an incipient partition wall on the left. When they resumed work almost two weeks later, they changed its position to the right. Unlike the rest of the oven which is built from bottom to top, the partition wall is built in vertical strips.© Carlos Gonzalez Ledo |
| Black-necked Swan Cygnus melancoryphus  To open a breeding season: a cygnet.© Roberto Ares |
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| New species: Long-tailed Meadowlark Sturnella loyca  Though taken almost two years ago, it is a most valuable record to the site.© Germán Pugnali |
Unicolored Blackbird Agelasticus cyanopus  Composite: Male and Female© Jorge García Vicente |
| Green-winged Saltator Saltator similis  © Claudia y Tito Di Mauro |
Southern Screamer Chauna torquata  © Claudia y Tito Di Mauro |
| Coscoroba Swan Coscoroba coscoroba  The position of this bird in the phylogenetic tree is being questioned. Genetic studies suggest that it is basal (more primitive) to the swans,but that it is closely related to the Cape Barren Goose. This standing bird looks more like a goose than a swan. Its legs are longer and are placed more at the center of the body, which gives it a more straight posture. Other differences with swans are the bill and the lack of caruncle. © Carlos Gonzalez Ledo |
Yellow-browed Tyrant Satrapa icterophrys  © Jorge García Vicente |
| Yellow-chevroned Parakeet Brotogeris versicolurus  © Jorge García Vicente |
European Starling Sturnus vulgaris  After the molt the new feathers of the starling have white tips, which gives it a mottled aspect. With time mottles disappear because the tips wear off.© Claudia y Tito Di Mauro |
| Guira Cuckoo Guira guira  A typical scene in cold weather: Guira Cuckoos huddle up to keep warm.© Jorge García Vicente |
Sulphur-bearded Spinetail Cranioleuca sulphurifera  © Jorge García Vicente |
| Yellow-winged Blackbird Agelasticus thilius  Male© Claudia Furman |
Yellow-winged Blackbird Agelasticus thilius  Female© Jorge García Vicente |
| White-faced Whistling-Duck Dendrocygna viduata  A new family of whistling-ducks with twelve chicks.© Roberto Ares |
Wattled Jacana Jacana jacana  Five juveniles and one adult were seen in this pond. Will they have been born here?© Roberto Ares |
| Btown-chested Martin Phaeoprogne tapera  The antenna, a meeting point to undertake a long trip. They come here for the summer to breed and now it is time to leave.© Carlos Gonzalez Ledo |
Thick-tailed Opposum Lutreolina crassicaudata  Not frequently seen so exposed, this opposum was chasing a baby Black and White Tegu Lizard Tupinambis merinae. As they disappeared into the vegetation, it remained a mistery how the chase ended.© José Luis Merlo |
| Orange-backed Troupial Icterus croconotus  © Carlos Gonzalez Ledo |
Epaulet Oriole Icterus cayanensis  © Carlos Gonzalez Ledo |
| White-faced Ibis Plegadis chihi  A flock flying past in V formation.© Carlos Gonzalez Ledo |
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| Lake Duck Oxyura vittata  A pair with a juvenile, becoming a male.© Roberto Ares |
Brazilian Duck Amazonetta brasiliensis  Male© Roberto Ares |
| Southern Screamer Chauna torquata  A solitary and silent screamer. It flew across the pond without screaming.© Roberto Ares |
Coot-Swan F. armillata-C. coscoroba  The Coscoroba occupies the coot´s platform to preen itself. No matter how big it is, the coot faces up to the swan to claim for its place and turns out victorious.© Roberto Ares |
| Streaked Flycatcher Myiodynastes maculatus  © Carlos Gonzalez Ledo |
Creamy-bellied Thrush Turdus amaurochalinus  Juvenile. The bill has not turned yellow yet.© Carlos Gonzalez Ledo |
| Great and Snowy Egrets E. alba y E. thula  This small body of water became trapped after high tide. Full of fish it is an ideal place for these egrets to feed.© Carlos Gonzalez Ledo |
Ringed Teal Callonetta leucophrys  Perching ducks differ from other duck species in that they perch in trees. The pointed claws are a specialization for this. The Ringed Teal belongs to this group and this is its favourite post.© Jorge García Vicente |
Entrevista a Tito Narosky
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