Date Added
January 12, 2019
06:46 AM -03
Date Added
April 14, 2024
11:14 AM UTC
Date Added
April 4, 2024
11:01 PM UTC
Date Added
April 4, 2024
12:47 PM UTC
Description
Un individuo de Marmosita Chaqueña transitando sobre un bosque de Palo Santo
Date Added
April 2, 2024
12:55 PM -03
Date Added
November 4, 2019
09:25 AM MST
Description
not exact location. This bird is well known by the park rangers. Amazing sighting of the bird fighting with a branch it eventually broke off and flew out of sight, presumably to a nest it may be building/maintaining?
Date Added
December 13, 2023
11:43 AM -03
Date Added
December 10, 2023
08:46 PM -03
Date Added
December 9, 2023
01:04 PM -03
Date Added
November 24, 2023
10:33 AM -03
Date Added
November 26, 2023
05:00 PM UTC
Description
Garra de tardígrado al microscopio electrónico de barrido de electrones. El tardígrado fue recolectado del musgo en árboles de Puerto Blest, en la imagen se aprecia el cuarto par de patas del género Minibiotus.
Date Added
April 18, 2022
10:38 PM -03
Date Added
November 16, 2023
11:16 PM UTC
Date Added
February 24, 2022
07:18 PM -03
Date Added
November 6, 2023
12:51 PM UTC
Description
Sobre un camalote a la orilla del río.
Date Added
January 14, 2021
08:32 PM -03
Date Added
October 21, 2023
04:14 AM UTC
Date Added
October 21, 2023
04:14 AM UTC
Date Added
September 5, 2014
12:37 PM EDT
Date Added
March 23, 2023
03:05 PM NZDT
Date Added
September 17, 2023
01:18 AM -03
Date Added
August 25, 2023
01:00 PM UTC
Date Added
June 22, 2019
12:42 PM PDT
Date Added
December 27, 2022
07:47 PM -03
Date Added
February 28, 2021
06:06 PM -03
Date Added
July 22, 2023
12:14 AM -03
Date Added
December 14, 2021
04:05 PM -03
Date Added
June 11, 2023
06:24 PM -03
Date Added
July 11, 2023
08:02 PM -03
Date Added
July 30, 2022
03:07 PM UTC
Date Added
April 30, 2023
11:41 PM UTC
Date Added
June 25, 2023
09:44 PM -03
Date Added
June 11, 2023
02:11 PM -04
Date Added
June 3, 2023
08:36 PM -03
Date Added
December 3, 2017
11:27 PM -03
Date Added
May 2, 2023
03:31 AM UTC
Date Added
April 29, 2023
01:31 AM UTC
Date Added
April 26, 2023
07:12 PM -04
Date Added
April 22, 2023
05:26 PM UTC
Date Added
February 6, 2023
12:57 PM -03
Date Added
January 10, 2022
05:39 PM UTC
Date Added
March 2, 2023
10:42 PM UTC
Date Added
May 11, 2020
08:50 AM -04
Description
solo caparazón en la playa
Date Added
March 18, 2023
11:26 AM -03
Date Added
April 1, 2023
10:44 PM UTC
Date Added
August 1, 2022
08:01 AM -03
Date Added
March 18, 2023
02:57 PM UTC
Date Added
March 18, 2023
05:26 PM -03
Date Added
March 18, 2023
05:26 PM -03
Date Added
March 9, 2021
08:15 PM -03
Date Added
October 11, 2020
10:29 PM -03
Date Added
January 5, 2022
09:29 AM -03
Date Added
February 4, 2023
09:49 PM -03
Date Added
February 4, 2023
07:01 PM -03
Description
Perdón, le falta una estrella
Date Added
January 28, 2023
07:58 PM -03
Date Added
February 3, 2023
09:40 PM -03
Date Added
February 1, 2023
03:28 PM -03
Date Added
November 4, 2022
10:49 PM UTC
Date Added
January 4, 2023
12:34 AM UTC
Date Added
January 1, 2023
09:03 PM -03
Date Added
December 5, 2022
11:45 AM -03
Date Added
November 19, 2022
07:30 PM -03
Date Added
November 9, 2022
08:51 PM -03
Date Added
October 26, 2022
02:31 PM UTC
Date Added
October 22, 2022
08:39 PM UTC
Date Added
October 22, 2022
08:39 PM UTC
Date Added
October 18, 2022
06:28 PM -03
Date Added
October 11, 2022
09:00 AM -03
Date Added
October 10, 2022
07:21 PM UTC
Date Added
October 8, 2022
11:41 PM UTC
Date Added
October 4, 2022
08:56 AM -03
Date Added
September 30, 2022
12:20 AM UTC
Date Added
September 27, 2022
01:14 AM UTC
Date Added
September 26, 2022
08:32 PM UTC
Description
Una cantidad impresionante. Con el poco alimento disponible, se los observa muchísimo arriba de la vegetación...me animo a decir que arriba de 3 metros.
Los observé arriba de chañares, jarillas (ambas Larreas sp.), algarrobos e incluso en una zampa. También notamos, que muchas jarillas están peladas en la parte baja y la corteza pelada, más bien mordida.
Date Added
September 26, 2022
05:36 PM UTC
Date Added
September 25, 2022
09:27 AM -03
Date Added
September 2, 2022
11:36 PM -05
Date Added
September 22, 2022
11:36 PM -03
Date Added
September 23, 2022
10:34 AM -03
Description
En el centro de la imagen, el causante del revuelo
Date Added
September 5, 2022
02:29 AM UTC
Date Added
September 5, 2022
02:43 AM UTC
Date Added
December 14, 2021
07:23 PM -03
Date Added
December 14, 2021
07:23 PM -03
Date Added
August 29, 2022
07:56 PM -03
Date Added
July 23, 2022
06:56 PM -04
Date Added
July 29, 2022
09:41 PM -04
Date Added
July 25, 2022
07:07 PM -04
Date Added
April 26, 2022
08:53 PM -03
Description
AB = 46,6 mm
La quilla interna de la oreja termina por detrás del borde posterior del
antitrago lo que indicaría que se trataría de E. bonariensis
Date Added
July 26, 2022
09:04 PM UTC
Description
No me lo identifica con nada
Date Added
February 19, 2022
04:03 PM UTC
Description
Individuo leucocístico, morfo común en la zona.
Date Added
July 23, 2022
06:22 PM -04
Date Added
July 23, 2022
05:27 PM -04
Date Added
February 7, 2022
08:26 PM -03
Date Added
November 2, 2019
01:39 PM -03
Date Added
July 8, 2022
07:35 PM -03
Description
These three photos show two interesting aspects of R. arenarum populations in Mendoza Province.
Photos 1-3 show irregularly arranged, bright yellow spots on the back and sides of this animal. Jose Cei (1959) made observations on the number of animals that had these spots. He found that in Mendoza and adjacent San Jose Provinces, up to one-quarter (25%) of a local population may be spotted. In nearby provinces like San Luis and Cordoba, none, or singleton spotted animals were found. So, there is a geographic part to what exists in this wide-spread species. What is the meaning/importance of these bright spots? In some strains of laboratory mice, similar, irregular spotting is well understood as happening because of cells are mutated to lack pigment (melanin) while the early embryo is forming the layer of cells that will ultimately become the skin of the mouse. The mutant cells multiply and ultimately form patches of of white skin and hair. Presumably, something like this is happening here, with clones of yellow-pigmented cells appearing on different parts of what will become the dorsal skin during embryological development. Nothing more than Cei's report seems to have been published about the biology of this unusual coloration.
Photos 2 and 3 show the second unusual condition in these Mendoza-San Jose toads - a reflex that Cei called "hypnotic" and "spastic". When one of these toads is disturbed, it assumes this position, with its legs pulled in close to the body, the back curled over, and the eyes closed. The animals remain like this for many minutes. Cei found that the frequency of this behavior was much higher than yellow-spotting, reaching 60 percent in some of these same Mendoza/San Jose populations. It was absent in populations from other populations. The behavior is probably an adaptive, defense against attack by predators. Making the body as compact as possible, and secreting the noxious fluids from the large glands on the dorsal surface presumably keeps predators from attacking and hurting the animals. But again, I haven't found further experimental studies that would support, or not, this claim.
This common toad is full of interesting things for naturalists to study!
Date Added
January 8, 2020
05:14 PM -03
Date Added
July 2, 2022
08:15 PM -03
Description
In 1982 these aquatic frogs were very abundant in Laguna Blanca, with as many as a dozen or so hiding under rocks in the shallow water at the edge of the lake. Within a couple of years they had all been eaten by the introduced trout and "trucha criolla" (Percichthys trucha). The extinction of the frogs led to an irreversible collapse of a unique aquatic ecosystem.
Date Added
June 6, 2022
09:10 AM -03
Date Added
June 28, 2022
01:44 AM UTC
Description
Observada en un sendero que costea el río. Zona de bosque
Date Added
June 29, 2020
03:58 PM -03