News - January 2017
The fishermen normally throw fish to the coast. There a neotropic cormorant and a rufescent tiger-heron were waiting. The cormorant got an Ossancora eigenmanni. Other cormorants approached. It was about to eat the fish, but a juvenile kept it and flew away with the prey
Ricardo says that the cormorant tried to eat this chameleon cichlid Australoheros facetus. It took the fish and turned it to put it in the right position but unsuccessfully. Another cormorant had a try too but failed. These cichlids may be 30 cm. The cormorant stayed above water a bit then it dived and the story was left unfinished
The screaming cowbird parasitizes almost exclusively the Greyish Baywing. A characteristic of this parasitism is the similarity of the plumage in the chicks of these two species till the time the screaming cowbird begins to change into adult plumage. Black spots begin to cover the screaming cowbird's body till it becomes black. In these photos we can see practically the beginning of this process. .
Fight between two factions of white-faced whistling-ducks. Some spectators were a bit altered wattled jacana, neotropic cormorants, roseate spoonbill and others seemed indifferent
Feeding the chicks
Female in the nest
A juvenile learning to eat.
With the great egret searching for food. Note the difference in size between the great egret behind
A juvenile eating and preening
Myiarchus swainsoni20-11-16 © Juan Carlos Ferreyra
14-1-17 © RAP
19-1-17 © Claudia Mon
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Photos in video format. Shows speculum and white rump
|Another case of hibridization|
We presume this individual is a hybrid of White-faced Whistling-Duck and Fulvous Whistling-Duck. This is not the first case (See previous reports), but this time Sergio tood two photos which show very clearly the conjunction of both whistling-ducks' characteristics.
18-1-17 © Sergio Cusano
In the last phot with a roseate spoonbill and yellow-billed teal.
|New moth: Hylesia nigricans
Hylesia nigricans14-1-17 © Eduardo Cusano
14-1-17 © Sergio Cusano
It belongs into the family Saturniidae, subfamily Hemileucinae. The hairs of this moth are urticating and cause dermatitis when in touch with the skin.
|Urutu pit viper
Bothrops alternatus12-1-17 © J. Simón Tagtachian
12-1-17 © J. Simón Tagtachian
12 1 17 © Nicolás Giorgio
Nicolás was in the new viewpoint looking for the spoonbill when two whistling herons flying from Brasil stopped next to the viewpoint and began with this courtship ritual.
They moved in circles and crouched alternately. The stretched out the neck and screamed. They kept their feathers ruffled. It took six minutes and then disappeared behind some trees.
Simón from the sidewalk captured this 30 seconds of action
12 1 17 © J. Simón Tagtachian
Platalea ajaja7 1 17 © J. Simón Tagtachian
7 1 17 © J. Simón Tagtachian
7 1 17 © J. Simón Tagtachian
The Roseate Spoonbill is not frequently seen at the reserve, though for the last days its permanence in the pond is calling the attention of birdwatchers. On 5th of January Juan Carlos Ferreyra shared the first photo of a spoonbill at Coypu and with better or worse luck everybody enjoyed the sight of this magnificent bird. On a walk we detected three individuals, one at Coypu Pond and two others which were very far at the Gull Pond.
This individual is a young and is feeding. In the photos above it detects the prey by feel, using the sensors in the bill. In the one below it finds it visually.
See more about feeding technique 7 1 17 © J. Simón Tagtachian
Columba livia4 1 17 © J. Simón Tagtachian
4 1 17 © J. Simón Tagtachian
The presence of this pigeon called our attention. Normally, rock pigeons are found in the sidewalk. It is ringed