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Fri, Apr 19, 2013 12:04 AM
I have corrected my list of the heaviest jaguars. Maybe someone could
add more data, but for the moment, this is what I have found.
Just a correction, according with Google books, the edition of De Almeida
book that I have used is of 1990, not 1993.
Records of the heaviest jaguars (Panthera onca) from scientific sources and reliable hunting literature:
o 148 kg. Pantanal, South of Brazil [Radiocollared by scientists in the field] (Cavalcanti, Pers. Comm., 2012).
o 130 kg. Porto Primavera, South of Brazil (Morato et al., 2001).
o 119 kg. Pantanal, South of Brazil. (De Almeida, 1990; Sunquist &
o 105 kg. Emas NP, Center
of Brazil. (Soares et al., 2006).
o 121 kg. Los Llanos, Venezuela. (Hoogesteijn & Mondolfi, 1993; Sunquist
& Sunquist, 2002).
93 kg. Hato Piñero, Venezuela. (Scognamillo et al., 2003).
Paraguay: 106 kg. Chaco paraguayo (McBride,
Amazonas: 96 kg. No specific location (Sunquist
& Sunquist, 2002).
Bolivia: 93 kg. Guapore river (De Almeida, 1990).
Central America: 66 kg. Belize (Rabinowitz &
Nottingham, 1996; Sunquist & Sunquist, 2002).
United States of America:
o 63.6 kg. Texas (Schmidly & Davis, 2004).
o 53.5 kg. Arizona (Arizona Game and Fish Department, 2009).
Peru: 37 kg. Peruvian forest (Hoogesteijn
& Mondolfi, 1996; Sunquist & Sunquist, 2002).
* Note: Some of the
records belong to small samples and offers only suggestive results. There are
reports in Brazil and Venezuela of jaguars of up to 145-160 kg in literature (Guggisberg,
1975; Hoogesteijn & Mondolfi, 1993), but this may represent gorged specimens (De Almeida, 1990) and in some cases, it is difficult to confirm those figures.
Fri, Apr 19, 2013 12:20 AM
Fri, Apr 19, 2013 10:35 AM
Fri, Apr 19, 2013 5:25 PM
In the tradition of having all the
available data about the heaviest cats recorded by scientists, pictures are a
basic fact that we most have.
So, just like we have the picture of
the heaviest tiger (Nepalese "Sauraha" male), lion (Etosha male) and leopard
(Namibia male), here it is the picture of the heaviest jaguar in scientific
The text is in Spanish and
translated to English is this:
“Photo No. 7: The weight of the jaguar
varies greatly according with the geographical region from the Central
Americans of 50 kg to specimens like this of 148 kg captured for studies with
radio-collar in the northern Pantanal.”
Is important to mention that its
belly is practically flat, which suggest that contrary to my previous
statements, it seems that this huge jaguar was “empty belly”, not like the 159
kg jaguar of Sasha Siemel. I will email to Dr Cavalcanti again, maybe she have
the body measurements of this great cat.
Here is the document (also in Spanish):
To be sincere, I am not 100% if this
is the same male captured by Dr Cavalcanti in the video, but it looks of the
same size, they are of the same area and I really doubt that they were two 148
kg jaguars in records by now. So, this is the ONE.
Sat, Apr 20, 2013 12:27 AM
Thu, Apr 25, 2013 4:38 AM
Tue, Apr 30, 2013 5:20 AM
Wed, May 1, 2013 5:25 AM
[big] Canabalism of female adult Jaguar by 2 adult male Jaguars:[/big]Among most free-ranging carnivores, populations seem to be regulated by social interactions manifested through territoriality and aggression (Lindzey et al., 1994; Pierce et al., 2000; Adams, 2001). Instances of aggression and killing of conspecifics have been reported mostly as cases of interspecific killings (Palomares and Caro, 1999) or infanticide (Agrell et al., 1998; Soares et al., 2006), which significantly contributes to mortality of juveniles (Packer and Pusey, 1984; Balme and Hunter, 2004). Although less common than infanticide, intraspecific aggression resulting in death and consumption of an adult conspecific, i.e., cannibalism, has been reported among large terrestrial carnivores (Hunter and Skinner, 1995; Logan and Sweanor, 2001; Amstrup et al., 2006; Galentine and Swift, 2007). Among adult felids, factors that lead to cannibalism may include defense of cubs (Logan and Sweanor, 2001), defense of prey (Galentine and Swift, 2007), and apparent competition (Hunter and Skinner, 1995). Although much has been reported regarding agonistic behavior within felids, incidents of cannibalism among jaguars (Panthera onca) are rare and, so far, restricted to infanticide (Soares et al., 2006). Here, we document an observation of cannibalism of an adult female jaguar by two adult male jaguars.On 24 November 2007, a jaguar was found ca. 3 days post-mortem in a dense semi-deciduous forest on the western border of the ranch. The carcass was lying on the ground, uncovered, under the shade of a tree and not yet consumed by scavengers. The carcass was a fully grown adult female jaguar, in apparent good nutritional condition (body weight = ca. 60 kg) and, based on wear and staining of dentition, ca. 3-4 years old. Necropsy revealed multiple wounds inflicted on the throat and forelegs, deep punctures at the first, second, and third cervical vertebrae and scapulas, and the abdominal cavity was opened. Multiple wounds matched the size and shape of a bite by a large carnivore. The left forequarter, left forepaw, and distal portions of some ribs had been partially consumed. We did not find fractures on the skull or other bones.Full story for those interested:http://www.biomedsearch.com/article/Cannibalism-among-jaguars-Panthera-onca/246536474.htmlNot only is that the first reported case of cannibalism on other adult Jaguars, but it was interesting to note that it was two adult Jaguars that killed that female & the fact that they were males working together!
Wed, May 1, 2013 5:34 AM
Jaguar v. sea turtle: when land and marine conservation icons collide
(Jaguar with its marine turtle prey. Photo by: Benjamin Barca.)
At first, an encounter between a jaguar (Panthera onca) and a green sea turtle (Chelonia mydas) seems improbable, even ridiculous, but the two species do come into fatal contact when a female turtle, every two to four years, crawls up a jungle beach to lay her eggs. A hungry jaguar will attack the nesting turtle, killing it with a bite to the neck, and dragging the massive animal—sometime all the way into the jungle—to eat the muscles around the neck and flippers. Despite the surprising nature of such encounters, this behavior, and its impact on populations, has been little studied. Now, a new study in Costa Rica's Tortuguero National Park has documented five years of jaguar attacks on marine turtles—and finds these encounters are not only more common than expected, but on the rise.
"Although there are records of marine turtles predation by jaguars in other countries nowhere else the numbers of predated turtles are nearly as high. I think that the interaction in itself is very likely to be a normal predator-prey interaction," lead author Diogo Veríssimo told mongabay.com. "But the quick increase in predation observed in Tortuguero that could be a symptom of an unbalance in the ecosystem."
Over five years Veríssimo and his team recorded a total of 676 marine turtles killed by jaguars. The vast majority (over 99 percent) of those killed were green sea turtles, but jaguars also preyed on three hawksbill sea turtles (Eretmochelys imbricata) and one leatherback marine turtle (Dermochelys coriacea), the world's largest. Over the five years, more and more sea turtles were killed by jaguars, rising from an average of less than 2 found per survey to over 5.
(Flipper of marine turtle killed by a jaguar in Suriname. Photo by: Jeremy Hance.)
"With a minimum of 189 individuals predated in the last season, predation of adult turtles has now reached a magnitude never before recorded in a marine turtle rookery," the scientists write.
Why the sudden uptick in what is considered by biologists rare behavior?
"Several factors could be playing a role," says Veríssimo. "One would be a potential decrease in other jaguar prey such as peccaries or deer, as a result of hunting by local populations. Another possibility is that jaguars are being driven towards the coast as habitat is cleared and fragmented around Tortuguero National Park."
Green sea turtles are currently listed as Endangered by the IUCN Red List and are imperiled a large number of threats, including accidental bycatch, light pollution, beach development, and both legal and illegal harvesting of turtle eggs. Jaguars are less threatened than their oceanic prey, but are still listed as Near Threatened due to deforestation, prey decline, and targeting by ranchers. So, the rise in preying on endangered marine turtles by America's biggest cat begs the question: what, if anything, should be done?
Veríssimo recommends more research and monitoring before any action is taken. Future research should especially focus on the park's jaguar population, which has been little studied to date. He also notes that though the total number of marine turtles killed—676—may seem high, researchers should not see this as an alarming concern—yet.
"The nesting population of marine turtles in Tortuguero is one of the largest in the world and as such at the moment I do not think jaguar predation is a major threat. Furthermore, we need to remember that marine turtles from this population are still being harvested in Nicaragua in far greater numbers than those currently being predated," he explains, "nonetheless it rests to be seen at what levels the jaguars predation starts to level off as the increase in recent years has been fast."
Jaguar and marine turtle conservationists should begin sharing information, says Veríssimo, to "ensure that there is a landscape perspective when it comes to understanding of this predator-prey interaction."
In the meantime, marine turtles will, as they always have, risk their lives in producing the next generation, and jaguars, consummate hunters, will take advantage of the oceanic reptiles' sudden vulnerability. And nature will continue to surprise us.
(A camera trap catches jaguars feeding on a sea turtle at night when the fateful encounter occurs. Photo courtesy of: Diogo Veríssimo)
(Green marine turtle corpse after being preyed on by a jaguar in Suriname. Photo by: Jeremy Hance.)
(Green marine turtle corpse after being dragged in from the beach in Suriname. By the next day the jaguar had dragged it into the forest seen in the back. Photo by: Jeremy Hance.)http://news.mongabay.com/2012/0516-hance-jaguars-sea-turtles.html
PLATE 1 (a) Green turtle Chelonia mydas and (b) leatherback turtle Dermochelys coriacea, with typical signs of jaguar Panthera onca
predation, and (c, d) camera-trap photographs of jaguars feeding oﬀ green turtles. (All photographs GVI Costa Rica).Full study for those if any who are interested.
Mon, May 20, 2013 8:46 PM
Mon, May 20, 2013 10:40 PM
Golden Cougar wrote:400 lb Jaguar from Venezuela.
Mon, May 20, 2013 10:45 PM
Fri, May 24, 2013 10:44 PM
Fri, May 24, 2013 10:53 PM
Tue, Jun 18, 2013 8:09 PM
Tue, Jun 18, 2013 8:12 PM
Wed, Jun 19, 2013 12:35 PM
Wed, Jun 19, 2013 2:57 PM
Fri, Jun 21, 2013 2:47 AM
For the record and future tables, here is the
figure of another male jaguar of 130 kg captured in 1998:
It seems that there are several Southern Brazil
jaguars that reached this figure. Sadly, it is not stated if it had or not some
Prathap, the picture of the jaguar and the
anteater is excellent and unique, as far I know. Thanks for posting it.
Fri, Jun 21, 2013 3:18 AM
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