News - January 2010



Coscoroba Swan
Coscoroba coscoroba
Coscoroba Swan
22-01-10 © Claudia y Tito Di Mauro

At Coypu Pond there are two pairs that had already built the platforms and are already sitting on eggs


House Wren
Troglodytes aedon
House Wren
17-01-10 © Claudia y Tito Di Mauro
As links in the food chain birds are subject to predation, too. This snake is swallowing whole a House Wren chick

Parasitism of Rosy-billed Pochard by Fulvous Whistling-duck
Rosy-billed Pochard
Netta peposaca
Rosy-billed Pochard
29-01-10 © Roberto Ares

After a month we have discovered the rosy-billed pochard family with the fulvous whistling-duck. They have grown and their plumage looks like the adults'. The rosybills are all in female plumage, The juvenile males have not changed into the adult male plumage yet. The fulvous whistling-duck already shows the black line down hindneck and the creamy bars on flanks. 

Rosy-billed Pochard
29-01-10 © Roberto Ares
Rosy-billed Pochard
17-12-09 © José Luis Merlo

This female rosy-billed pochard has adopted this fulvous whistling-duck. The little whitling-duck clearly differs from her own offspring. Laying eggs every nos and them by birds which normally nest is known as facultative parasitism. Here the host is the rosy-billed pochard. Her duty is not as tedious as that of other hosts since ducks do not feed their ducklings. They only lead them to feeding grounds. 



Common Gallinule
Gallinula galeata
Common Gallinule
03-01-10 © Amelia Besana
Common Gallinule
03-01-10 © Amelia Besana
Common Gallinule
03-01-10 © Amelia Besana
Chalk-browed Mockingbird
Mimus saturninus
Chalk-browed Mockingbird
10-01-10 © Amelia Besana
House Wren
Troglodytes aedon
House Wren
09-01-10 © Claudia y Tito Di Mauro
House Wren
09-01-10 © Claudia y Tito Di Mauro
Nenday Parakeet
Aratinga nenday
Nenday Parakeet
09-01-10 © Claudia y Tito Di Mauro