Reserva Ecológica Costanera Sur

Sitio realizado por aficionados a la observación de aves desde 10 de enero 2006

Brown-hooded Gull - Historic records

Order: - Family: Laridae

25-05-16 © J. Simón Tagtachian
14-05-16 © J. Simón Tagtachian
07-05-16 © J. Simón Tagtachian
07-05-16 © J. Simón Tagtachian
05-12-15 © J. Simón Tagtachian
24-10-15 © J. Simón Tagtachian
13-07-15 © Claudia y Diego Bastías
09-07-15 © Eduardo Carreyra

Interesting to see how it stands on water as if being supported by the tail and with the feet underwater, catches an Oligosarcus jenynsii and takes off. After all the effort it loses the prey.

09-07-15 © Eduardo Carreyra

Interesting to see how it stands on water as if being supported by the tail and with the feet underwater, catches an Oligosarcus jenynsii and takes off. After all the effort it loses the prey.

09-07-15 © Eduardo Carreyra

Interesting to see how it stands on water as if being supported by the tail and with the feet underwater, catches an Oligosarcus jenynsii and takes off. After all the effort it loses the prey.

09-07-15 © Eduardo Carreyra

Interesting to see how it stands on water as if being supported by the tail and with the feet underwater, catches an Oligosarcus jenynsii and takes off. After all the effort it loses the prey.

09-07-15 © Eduardo Carreyra

Interesting to see how it stands on water as if being supported by the tail and with the feet underwater, catches an Oligosarcus jenynsii and takes off. After all the effort it loses the prey.

10-04-15 © J. Simón Tagtachian
21-02-15 © J. Simón Tagtachian
09-08-14 © J. Simón Tagtachian
22-09-13 © J. Simón Tagtachian

With yellow-billed teals

28-07-12 © J. Simón Tagtachian

The breeding season comes and we note that birds are more active. They seem to wake up.There are chases, displays, increase in vocalizations, etc. and there are also changes in their appearance, many of which pass unnoticed to the untrained eye. But the nuptial or alternate plumage leaps to the eye. This gull&rsquo;s nuptial or alternate plumage is a brown hood which covers its head, which is practically white in its basic (also called winter) plumage. <br />These changes are due to the preparation of the reproductive system for a new breeding cycle. Environmental factors such as day length, light intensity, temperature, etc regulate the activity of the pituitary gland which segregates the hormones which stimulate these changes. Late in the reproductive season these hormones are inhibited by others which curb all this efervescence till the next cycle

Total: 117

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