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A Fossa (Cryptoprocta ferox); photo by Keven Law)

A Fossa (Cryptoprocta ferox); photo by Keven Law)

Behold, the fossa (Cryptoprocta ferox), the top predator of Madagascar (exempting, as always, our own very predatory kind).  The fossa weighs between 5.5 and 8.5 kg (12 to 20 pounds) and lives mostly on primates—namely the lemurs which are everywhere indigenous to the strange micro-continent.  Since lemurs are brilliant climbers, the fossa is also an arboreal specialist and it can run down trees headfirst and execute stunning acrobatic leaps which would make a trapeze artist blanche and retire.  The predator prefers hunting lemurs but it also dines on bats, reptiles, tenrecs, rodents, birds, and whatever other small living creatures it can catch.

The first time I saw footage of a fossa, my mind kept insisting it was a cat…no a weasel…no a stretched-out bear.  Its extreme similarity to familiar predators combines in a sinister way with its lithe alien movements to make it seem very peculiar.  I wonder too if some desperate little tree-creature part of our brain doesn’t respond badly to the fossa-for it is difficult to look away from one in action, and it has many similarities with analogous predators encountered by our arboreal forbears.  It hunts both by day and night.  It climbs, swims, runs, and lurks with great skill–so there is never any true safety for animals which it preys on.

Cryptoprocta ferox.

Male Fossa (Cryptoprocta ferox) by Darren Naish

According to taxonomy and genetics, the fossa is indeed closely related to cats, bears, weasels, seals, and all of the other members of the order Carnivora. The fossa is perhaps most closely related to viverrids (the civets and genets), but it shares many features with felines as well, and may be considered to be descended from an intermediary form. The ancestor of the fossa first came to Madagascar around 20 million years ago, during the Miocene as forests dwindled and grasslands spread on Africa and as Madagascar drifted particularly close to the great continent.

Fossa yawning (photo by beachkat1)

Fossa yawning (photo by beachkat1)

Fossas live to around twenty years of age.  They have social lives similar to cats, and even have similar vocalizations.  Fossas of both genders have bizarre elongated external genitals (and the male member is equipped with backwards pointing spines).  Additionally, they secrete an orange substance which “colors their underparts”.  You can go look up details and pictures on your own time.   The mother fossa gives birth to litters of two to four (though occasionally as few as one or as many as six) cubs, which mature slowly.  Physical maturity is not reached until the age of two and the young fossa do not reproduce until a year or two after that.  Fossa have always been solitary and rare, but human habitat-destruction (among other ills) seems to be making them even scarcer.

A Fossa Cubs born at Catoctin Wildlife Preserve in Maryland

A Fossa Cubs born at Catoctin Wildlife Preserve in Maryland

I started writing this post imagining that the fossa would be esoteric and largely unknown to most of my readers, but the internet quickly revealed that it is a film star and a media darling of our age.  Apparently a fossa was the villain of “Madagascar” an animated children’s film about lemur society and a zoo-breakout. How did I miss an animated movie about lemurs?  I’m going to go watch that right now.

To borrow a page from the timeless style of Sesame Street, this week Ferrebeekeeper is brought to you by the Roman letter Q.  Each post will concern a topic which begins with that rare letter.  So quench your thirst with quinine water and wrap up in a quaint quilt. There is a reason that the letter Q is worth 10 points in scrabble but I think we can find 5 relevant topics that are not too quixotic (also I’m going to stop using extra q words for effect immediately—please don’t stop reading).

A Northern Quoll (Dasyurus hallucatus)

For the first q-themed post, we must travel to the ancient arid continent of Australia. For reasons of geology and tectonics, Australia has been a wallflower in the great continental ballet and has been isolated for the last 40 million years.  Thanks to this geographic seclusion, the animals of Australia are much different than the creatures which flourish elsewhere, and Austalia’s mammals are dominated by marsupials like the kangaroos, the wombats, the koalas, and the bandicoots.  All of those creatures are herbivores, but there are insectivorous marsupials (like the numbat) and there are marsupial carnivores which prey on the others.  Some of the larger orders of marsupial predators have died off as Australia dried out, but a major order of predators remain–the catlike quolls.

Quolls (genus Dasyurus) are solitary, nocturnal mammals which seek shelter in their burrows and dens by day and hunt birds, amphibians, reptiles, and small mammals at night. They are agile all-terrain creatures capable of swiftly moving across the forest floor or through the forest canopy.  Quolls kill their prey with a bite to the neck where it joins the head.  In addition to being predators, they also scavenge for carrion and they can sometimes be found by picnic areas and rubbish dumps. There are six species of quolls which range in size from 350 grams (12 ounces) to 3.5 kilograms (8 pounds). Four species are located across the Australian mainland while one species inhabits New Zealand.  One outlier species, the Bronze Quoll (Dasyurus Spartacus) lives in the savannah of New Guinea. The animals all share a characteristic spotted fur coat and a similar lifestyle.  The closest relatives of quolls are the formidable Tasmanian devils (the largest extant marsupial carnivores) and the superficially weasel-like mulgaras.

Unfortunately, quolls are not doing well.  Feral cats, dogs, and foxes are much more deft predators and are outcompeting the quolls or eating them outright (although the quolls do get some free meals from the invasive wave of rabbits and rats which have swept Australia).  Additionally the quolls are falling victim to an even stranger invasive species.  The Cane Toad (Bufo marinus) is a toxic South American toad which was brought to Australia in order to control agricultural pests.  The toads secrete a powerful toxin which is potent enough to kill a human (some people ingest cane toad secretions in order to experience the hallucinogenic effects).  Cane toads resemble some of the natural amphibian prey species of quolls and the spotted predators eat them voraciously—only to fall sick and die.  In order to save the unlucky quolls, a project is afoot to train the predators not to eat cane toads. Wildlife researchers have been dropping small sausages made of cane toad from airplane in quoll habitats.  It is hoped that quolls will eat the sausages and become violently sick (but not fatally so).  Having had a miserable bad trip, the quolls will then presumably forbear from eating further cane toad flesh.

The Cane Toad (Bufo marinus)

Ye Olde Ferrebeekeeper Archives

September 2020