Numbat Numbers

Numbat (Myrmecobius fasciatus), Endangered

Having just spent several months living and working in Australia, Australian species are especially interesting to me right now. Koalas, Kookaburras, and Kangaroos all crossed my path, as did Wallabies, Wattles, and Wombats. What didn't cross my path was a small creature known as a Numbat. This is likely because the Numbat is no longer common in the state of Victoria, where I spent almost all of my time.

Numbats used to live all across the southern regions of Australia. Their population was reduced to two tiny pockets in the state of Western Australia after the introduction of foxes. Since then, it has been reintroduced to a few small conservation areas, but still numbers less than a 1 000 animals in the wild.

The Numbat diet is a little bit monotonous, consisting of nothing but termites. Each individual can eat between 10 000 and 20 000 termites in a day! Unlike many other termite eating animals, however, Numbats are small, and lack claws or any other method to open up termite nests. This means that they have to forage for termites when the termites themselves are out of the nest foraging--that is, during the day--making it one of the very few marsupials active during the day. Being active during the day like this is thought to make them more susceptible to predation.

In the evening, when they aren't foraging, these rare marsupials retire to their burrows, which are very often inside of hollowed out logs. It is thought that an abundance of hollow logs to hide in may have saved the two groups of Numbats that survived in Western Australia, as they provided protected hiding places from predators.

These stripy furry animals are cute, no doubt about it. They're one of Western Australia's State Emblem's, and they've also been chosen as the icon for the Conservation Council of Western Australia. A captive breeding and reintroduction program is underway, and Numbats are bred at Perth Zoo and released each year into managed habitat. Here's a great video about hand-rearing baby Numbats at the zoo.

If you want to help Numbats, you can donate to Perth Zoo's Wildlife Conservation Action.

Yaminon

Northern Hairy Nosed Wombat (Lasiorhinus krefftii), Critically Endangered

This cute-ish animal is critically endangered. Endemic to Australia, it's range has steadily decreased, until in the early 80s, there were only 30-40 individuals in tiny Epping National Forest Park, about 800 km northwest of Brisbane. In 1982, Cattle were excluded from their habitat, and their population has risen to over 130.

In May of 2009, a number of Wombats were moved from Epping to a newly created nature reserve, just north of St. George, providing some protection for the species. The biggest threat to the species is a catastrophe such as fire, flood, drought, or disease, that could wipe out the entire population. Having two separate populations is a bit of a disaster insurance policy.

This largest of Wombat species, also sometimes referred to as the Yaminon, is now protected in both locations by predator proof fences to keep out dingos and other predators. Conservationists managing these populations engage in reproductive and behavioural research, as well as controlling invasive species of grass, controlled burns of habitat, DNA studies to estimate population (by collecting hair samples with tape), and much more.

If you want to help out this nearly extinct animal, here's some ideas:

You could of course donate to the Wombat Foundation.

Or you could buy some children's books featuring Willit the Amazing Wombat.

Most importantly and least expensively though, you could learn more about the Northern Hairy Nosed Wombat, and then tell your friends.

Here are some very informative sites:

From the Queensland Government.
From Evolutionarily Distinct and Globally Endangered (EDGE).
From the Wombat Foundation.

Orange Bellied (Yellow Breasted Green Headed Blue Winged) Parrot

Orange Bellied Parrot (Neophema chrysogaster), Critically Endangered

Photo copyright Dave Watts

The Orange Bellied Parrot is sick, and this is a really bad time to be sick.

With a mere 50 or so individuals surviving in the wild, this species is edging closer to extinction every day. For the past few years, the wild population has been estimated between 140 and 180 birds--a steep decline from 'common, or locally abundant' in the 1920s. Only in the past year have the numbers dropped even lower as sightings of wild birds have grown fewer.

Three captive breeding populations exist in zoos around Australia, and it's these unfortunate Orange Bellies that are sick. An unknown virus has infected birds in the captive breeding program, causing some of them to lose their feathers and weakening their immune systems. Scientists believe that the virus may spread more easily in the captive population because they are so close to each other. The program has had some success annually releasing captive-bred birds to help sustain the wild population--so if the captive breeding program suffers, so will the wild population.

Orange Bellies are a migratory species, breeding and nesting in southwestern Tasmania, and spending the rest of the year in coastal areas in South Australia, Victoria, and New South Wales. This month is migration month, and all wild Orange Bellies are making their way south to Tasmania, where mated pairs will build nests and lay 2-6 eggs.

Of course, these parrots also face the usual threats of habitat loss and invasive species. You can learn more about their food, habitat, life cycle, and what's being done to help them here. If you live in Australia and want to help, you could volunteer with Birds Australia.

Farewell, Tiny Friends

Christmas Island Pipistrelle (Pipistrellus murrayi), Critically Endangered

Sometimes, saying goodbye is hard. It's not hard to say goodbye to your friend, when you're leaving the coffee shop, because you know you'll see each other tomorrow. It's a different story though, when you're saying goodbye to your friend, because they're getting on a plane to Peru and you don't know if you'll ever see them again.

That's kind of how I feel right now about the Christmas Island Pipistrelle. This tiny bat, weighing about the same as three paperclips, has been saying farewell for the past 14 years. For more than a decade, the CI Pipistrelle has declined at least 10% percent every year. Now, in 2009, the total number of CI Pipistrelles likely stands at less than twenty.

Without a last minute miracle, this bat is headed straight for extinction. In fact, it may already be extinct. With the hope of starting a captive breeding program, eight scientists have spent an entire month in an unsuccessful last ditch effort to trap any surviving bats.

The reasons for the relatively rapid decline of this bat are unclear. Most scientists involved seem to believe that it's demise is linked to one of the numerous non-native species introduced to Christmas Island--the small Australian island which is the sole habitat of the CI Pipistrelle. Whether it was the Common Wolf Snake, the Black Rat, the Yellow Crazy Ant, or some other species that resulted in its decline, the point is now almost moot.

Although there is a small chance that scientists may succeed in trapping a few bats to start a breeding program, as long as the non-native species remain, the Christmas Island Pipistrelle will not be living happily on Christmas Island.

And so, to the CI Pipistrelle, I bid a very sad farewell. I hope this isn't goodbye forever.

Mushrooms for Breakfast, Mushrooms for Lunch, Mushrooms for . . .

Gilbert's Potoroo (Potorous gilbertii), Critically Endangered

Gilbert's Potoroo, named for the English naturalist John Gilbert, is perhaps the most endangered marsupial in Australia. Known as the Ngil-gyte by local aboriginals, it is a small marsupial rat-kangaroo, with soft fur, bulging eyes, and a tail almost as long as its 30cm body. If you know what bandicoots and wallabies look like, a potoroo is somewhere in the middle. Fewer than 50 wild individuals are restricted to two tiny areas on the southern coast of Western Australia.

These shy nocturnal creatures are an oddity in the mammal world, in that they are fungivores. That is, 90% of their diet consists of truffles, the fruiting body of underground fungi. The spores of over 40 types of truffle have been found in their dung! The rest of their diet consists of small insects and small fleshy fruit.

It was first discovered around 1840 in southwest Australia, when John Gilbert wrote that large numbers were procured by aboriginals for food in the space of a few hours. By 1870, it was believed extinct. It wasn't until more than 120 years later, in 1994 that Gilbert's Potoroo was discovered, still alive in Two Peoples Bay Nature Reserve. Since then, a captive breeding population has been established in the same area, and another wild population has been established on nearby Bald Island. Currently, plans are underway to establish a third wild population at Waychinicup National Park.

The establishment of these distinct populations is crucial to increasing Gilbert's Potoroo's chances of survival. Threatened by wildfire (they live in dense, highly flammable vegetation that has remained unburnt for 50 or more years), introduced predators (feral foxes and cats), and changes to their habitat, their tiny population is at constant risk of extinction by a single catastrophic event. That is, a single wildfire could wipe out the majority of the population.

Research continues to learn more about the needs of Gilbert's Potoroo, as well as to help conservationists increase the breeding success of the captive population.

If you live in Western Australia, you can volunteer with the Gilbert's Potoroo Action Group, dedicated to preventing the extinction of it's namesake.

Learn more about Gilbert's Potoroo at Western Australia's Department of Environment and Conservation website.

David vs. Goliath, Mice vs. Albatross

Tristan Albatross (Diomedea dabbenena), Critically Endangered

According to Scientists from The Royal Society for the Protection of Birds (RSPB), the Critically Endangered Tristan Albatross has suffered its worst ever breeding season. Out of 1764 chicks counted in January, only 246 survived to fledge.

Tristan Albatrosses, which breed only on British-owned Gough Island in the South Atlantic, are being decimate by mice. According to Richard Cuthbert, an RSPB scientist, mice have been known to prey on the birds for a long time. Previously, the birds were threatened by introduced and non-native rats, pigs, dogs, and cats. Once these predators were removed, the mice population expanded.

The mice, originally introduced in the 18th or 19th century by sealers, are now three times larger than their mainland brethren, and have adapted to be carnivorous--subsisting on young birds and eggs rather than seeds and insects. Even though the mice have become larger, they are still vastly outweighed by the albatross chicks. Why don't the albatrosses fight back? Although they do fight back against other types of prey, it seems that they are not able or do not know how to appropriately fend off the non-native mice. The mice often work together, attacking at night, quickly gnawing through the nest and straight into the chicks body.

With such low numbers of surviving chicks, Tristan Albatrosses are very close to the brink of extinction. Relatively slow breeders, pairs only nest every other year, producing a single chick each time. Adults are further threatened by the long-line fishery. Fishing boats towing miles of fishing line, with thousands of hooks baited with squid or fish, often attract Albatrosses, who attempt to snag the bait and become entangled or hooked and drown.

"Tristan Albatross is being hit by a double whammy. The chicks are predated by mice and the adults and juveniles are being killed by longline fishing vessels," said John Croxall, chair of BirdLife's Global Seabird Programme. "Unsustainable numbers are being killed on land and at sea. Without major conservation efforts, the Tristan Albatross will become extinct."

Is there any hope? Some. In New Zealand, similar situations with rats have been successfully dealt with by dropping rat poison from helicopters. The RSPB has done preliminary studies indicating that a similar solution would solve the mice problem on Gough Island, and is encouraging the British government to come up with the needed funds.

You can help. Get involved with the Save the Albatrosses Campaign.

Donate to Bird Life International's Preventing Extinctions Program.

If you live in the UK, you can contact your representatives and ask them to support funding for wildlife in the UK Overseas Territories.

You can also donate to Sea Shepherd Conservation Society, which works against the illegal use of long line fishing.

Breeding Rails

Guam Rail (Gallirallus owstoni), Extinct in the Wild

Guam is a tiny island territory, comprising a mere 541 square kilometers, or a little more than half the size of New York City. Until the 1980s, this little island paradise was home to the Guam Rail, which existed only on this tiny patch of land. In 1980 The Guam Rail disappeared from its natural home.

What happened? It all goes back to World War II, when foreign ships accidentally imported the Brown Tree Snake. The ground-dwelling Guam Rails had never had to deal with predators such as snakes before, and were completely defenseless. The snakes decimated not only the Rails, but also 9 other native species, 5 of which were found nowhere else in the world.

The Guam Rail is not extinct yet, however, as it is still held in captivity in Guam and American zoos, and has been bred successfully. Although reintroduction efforts are underway on the nearby island of Rota, their success is far from guaranteed, as the Brown Tree Snake persists and continues to threaten introduced birds. Researchers have had some success in keeping snakes out of small controlled areas, but as long as the snakes pose a threat, this species will require monitoring and management.

Recently, the National Aviary in Pittsburgh, one of the few zoos working to breed the birds, shipped off another year-and-a-half old Rail to join its struggling fellows back in the wild. Godspeed and goodluck!

An Absence of Amphibians

Old pond
and a frog-jump-in
water-sound

This famous haiku by the Japanese poet Bashô evokes images of an evening filled with the chorus of croaking frogs and splashes as they leap into an old pond. Unfortunately, unnoticed by the majority of the world's population, frogs around the world are falling silent. As various threats to their survival converge, like ants on a fallen bread crust, amphibian species in every nation are facing extinction. Threats such as habitat loss and fragmentation, climate change, pollution, and invasive species are stacking themselves up against amphibian populations. To top it all off, the deadly chytrid fungus, perhaps helped along by global warming, is devastating amphibians everywhere. Chytridiomycosis, the disease caused by the fungus, causes a problem in the functioning of the amphibian's pores, making it difficult for them to absorb water. Without the ability to rehydrate, they soon die from a lack of water.

Now, scientists around the world are working together in an effort to save the amphibians from impending doom. Amphibian Ark, a collaboration between several conservation organizations, is asking zoos and botanical gardens around the world to create a safe haven for a species of amphibian. These havens would only be temporary, until the disease crisis has been averted, and the animals can be safely returned to their natural habitats. If their efforts are unsuccessful, I don't want to imagine what will happen to the balance of the world's ecosystems as a whole class of animals is wiped out.

This issue is not something to be taken lightly. It's downright scary when you think of the implications of what could happen if all of the frogs, toads, and other amphibians disappeared. Frog Matters, a blog with the latest happenings from Amphibian Ark has a great post on things that anyone can do to help prevent a mass extinction.

Donate now to help prevent the next great extinction.

When it rains, it pours.

Booroolong Frog (Litoria booroolongensis)

Another rare species of frog is on the brink of extinction. And no wonder. The Booroolong tree frog is confined to less than 10 square kilometers, has been affected by the frog-killing fungus, chytridiomycosis, has to deal with invasive species preying on its eggs and tadpoles, has lost much of its habitat, and the area where it lives is undergoing a drought, drying up it's breeding grounds.


Donate to the Amphibian Ark, a movement saving frog species in decline.

Devil Facial Tumour Disease

Tasmanian Devil (Sarcophilus harrisii)

In 1996, the Tasmanian Devil was placed in the category of animals at 'Least Risk' of extinction. In that same year, a few devils were observed and photographed with growths and tumors on their faces. Today, 10 years later, it is estimated that 40% of the Devil population has been wiped out by what has come to be known as Devil Facial Tumour Disease (DFTD). The disease causes large tumours to grow on the faces of the Devils, and once the tumours appear, there is no recovery--at least not yet. Researchers are actively pursuing research to combat DFTD and preserve the threatened population of Devils.

DFTD is transmitted by allograft, which is fairly rare. Allograft occurs when diseased cells are passed physically from one individual to another. In the case of DFTD, it is thought that the cells are passed between individuals during their frequent scuffles, or mating which often involves biting the necks of their partners.

Currently, captive breeding populations have been established to ensure that the species will survive in the event that DFTD causes them to disappear from the wild. There is also concern that competition with introduced species such as foxes will hinder the Devil's ability to recover.

Tasmanian Devils are confined to the island of, well, Tasmania, and are named for their eerie calls (my friends will tell you that at times, I can be convinced to attempt an imitation).

Here's a site with info on how you can get involved, donate, or volunteer.