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Posts Tagged ‘south american canids’

warrah

When the first settlers to the Falklands came from Britain, they discovered that even the most remote islands can have large predatory animals on them. The predator on the Falklands, though, is one of the most enigmatic beasts. Even today, scientists are still arguing about its exact taxonomy and natural history. This animal was a canid, but whether it should be classified with the coyotes, dogs, and wolves or with the South American “foxes” is still being debated. However, in the eighteenth and nineteenth century it was called the Falkland islands wolf, the Falkland islands fox, or the warrah.

The animal had no fear of people. Like most wild dogs that have lived free of persecution, the warrah was a very curious animal. In 1834, Charles Darwin wrote of the warrah in his Journal and Remarks ( The Voyage of the Beagle):

The only quadruped native to the island, is a large wolf-like fox, which is common to both East and West Falkland. Have no doubt it is a peculiar species, and confined to this archipelago; because many sealers, Gauchos, and Indians, who have visited these islands, all maintain that no such animal is found in any part of South America. Molina, from a similarity in habits, thought this was the same with his “culpeu“; but I have seen both, and they are quite distinct. These wolves are well known, from Byron’s account of their tameness and curiosity; which the sailors, who ran into the water to avoid them, mistook for fierceness. To this day their manners remain the same. They have been observed to enter a tent, and actually pull some meat from beneath the head of a sleeping seaman. The Gauchos, also, have frequently killed them in the evening, by holding out a piece of meat in one hand, and in the other a knife ready to stick them. As far as I am aware, there is no other instance in any part of the world, of so small a mass of broken land, distant from a continent, possessing so large a quadruped peculiar to itself. Their numbers have rapidly decreased; they are already banished from that half of the island which lies to the eastward of the neck of land between St. Salvador Bay and Berkeley Sound. Within a very few years after these islands shall have become regularly settled, in all probability this fox will be classed with the dodo, as an animal which has perished from the face of the earth. Mr. Lowe, an intelligent person who has long been acquainted with these islands, assured me, that all the foxes from the western island were smaller and of a redder colour than those from the eastern. In the four specimens which were brought to England in the Beagle there was some variation, but the difference with respect to the islands could not be perceived. At the same time the fact is far from improbable.

Darwin understood that the so-called foxes of South America are actually quite closely related to wolf-like canids. In fact, today, the genus for these “foxes” is now called Lycalopex (w0lf-foxes) . I prefer to call these animals “zorros” (Spanish for foxes). They are not Vulpes foxes, and one of these South American animals is called “the gray fox.”  It is sometimes called the South American gray fox to differentiate it from the gray fox that we have in North America. However, that name does not work well either. The gray fox of North America has a range that extends into Panama, Colombia, and Venezuela. To avoid confusion, I call the South American “foxes” zorros.

Darwin was quick to point out that the animal was not that similar to the Culpeo, which is the largest of the zorros. Culpeos are well-known as being the coyotes of the South American continent. They are mid-level predators and scavengers, and like coyotes on this continent, they are hated. However, they are not South American coyotes. They are big zorros.

By 1868, trapping and shooting to protect sheep and for the fur industry had wiped out the warrah. Humans killed them off before anyone could properly classify the species. It was the only species of wild dog to go extinct in modern times. (However, the Ethiopian wolf is the species most likely to join the warrah.)

In the 1880′s, Thomas Huxley classified the species with the coyote, not the culpeo and the other zorros. It had the morphology of a coyote, so its scientific name became Canis antarcticus.

However, modern taxonomists have gradually moved the warrah back to the zorros. Today, the warrah is placed in the genus Dusicyon, which was the genus of the zorros at one time.  The warrah remains in that genus even though the other zorros are now placed in Lycalopex. It would have remained with the South American foxes forever had somethng strange not happened.

In the 1990′s, molecular biology was coming to the fore. Studies of mitochondria DNA were being used to determine the evolutionary relationships of all sorts of animals. One of the first studies on the dog family was the seminal study by Dr. Robert K. Wayne of UCLA. It was this study that found that domestic dogs were conspecific with wolves, and that the red wolf was derived from mixing Old World and New World lineages of Canis. His study on the molecular evolution of the dog family can be found here.

Wayne also got mitochondrial DNA samples from the preserved skins of the warrah to determine the evolution and natural history of that species. Well, the results were a bit hard to handle.

The study found that the closest relative of the warrah was the coyote.

But that raised lots of questions. How did a coyote-like animal get to islands off the southern tip of Soth America?

Well, James Serpell offers an interesting theory.

Because there are no native members of the genus Canis in South America, the warrah was actually a domestic animal that may have been derived from coyote-like wild dogs in North America.  (I should add that the Dire Wolf, which did live in South America, was probably much more closely related to the coyote than the wolf. It is possible that there were other species of coyote relatives in the New World.)

The evidence that Serpell posits is the unsual shape of the warrah’s muzzle. “The facial region of the skull is wide and the frontal sinuses are expanded, both of which can be features of domestication….It is therefore possible that this canid was taken to the Falkland Islands in the early Holocene as a domestic animal and subsequently survived as a feral species.” (The Domestic Dog).  He also uses the Wayne data, which he received in the preliminary stages, to argue that the warrah belongs in the genus Canis.

So where does the warrah belong?  That is one question that has yet to develop anything like a scientific consensus. Perhaps more analysis of the morphology and molecular evolution can provide a better picture. It would be nice to know whether there were any mainland South American canids that were similar to the warrah other than the culpeo.

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But here’s a video of one from the Refugio Amazonas in Peru:

I’ve always called them small-eared dogs, because their taxonomic species name is microtis (small-ear).

South America has a great diversity of wild dogs. It probably has the greatest number of unique species of dog living in such proximity to each other of any other continent. Where I live, we have only three species of wild dog; the red fox, the grey fox, and the Eastern coyote. The number of South American “zorros” (false foxes) is amazing.

The short-eared dog is one of these unique species. We know very little about them. They eat lots of fish and fruit in their diets. They have very webbed feet, more so than other species of dog, including domestic “aquatic breeds.”  They can be found only in lowland Amazon rainforest, where only one other species of dog can be found, the bush dog, which also has small ears but has short legs like a dachshund and hunts in packs. They are found in Ecuador, Brazil, Bolivia, Peru, and Colombia, where this lowland Amazon forest exists. Where they are found, they exist only in very low densities. It is thought that canine distemper and rabies have greatly reduced its numbers. Again, we really don’t know much about this species.

You can read more about them here. I think the camera trap photo on this PDF really shows what an unusual animal this dog is.  The International Union for the Conservation of Nature’s Canid Specialist Group has a very good website that covers all wild dogs and their biology.  Interestingly, they don’t have much information on the grey fox.

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