| Brown-chested Martin 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. They differ in colour from their parents. Fledgelings are grayish whereas the adult 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  Juvenile© 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 |
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