The Pre-Menstrual Drop Bear: 5 Amazing Facts about Koala Sex

The Pre-Menstrual Drop Bear: 5 Amazing Facts about Koala Sex

The angelic face and innocent eyes of a koala hide a mischievous sprite, with one of the most interesting sex lives in the animal kingdom, worthy of a national Wild Koala Day, May 3, in their honour.

Fact #1. Female koalas have 3 vaginas

I’m sorry, what? The little devils….”

The animal world has many shocking secrets, and not all bodies are made the same. Under all that fluff and chubby cuteness, there’s a lot of woman!

  • How: She still has a single opening to the exterior, but just inside the vagina branches into three.
  • Why: Its part of her marsupial heritage. The plumbing runs through the middle of the baby factory, preventing the three branches from fusing into one.*1.

femaleKOALAReproductiveAnatomytext(OMG Imagine inventing a sex toy for koala girls.)

Fact #2. Male koalas have a forked penis

Watching a male koala become aroused is like a scene from an alien horror movie. Not only does his penis have two heads, it is pink, very large and prominently-veined.

The greater shock is that most marsupials have forked penises. Possums, wombats, sugar gliders, bilbies. But most have slender, elegant appendages. Koalas are unusual is that they are well-endowed in both girth and length.

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  • How: the two heads don’t stick out far and can be retracted.
  • Why: No-one really knows. Maybe it helps sperm enter two of the three branches of the vagina?

You want to see a close-up of that, don’t you?

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Fact #3. Koala sex is voice-activated

Its not a guy’s looks, wealth or power that turns on a lady koala, its his voice. The deepest bass and baritone notes are a koala lady’s aphrodisiac.*2

Barry White, Louis Armstrong, Leonard Cohen and Nick Cave would have done well as koalas.

Male koalas broadcast their availability in breeding season – October to March. Their voice travels far, and clucky females make their travel plans to the deepest voice in the land. Listen:

  • How: low sounds are usually produced by large bodies, so a deep voice is an indicator of a large, strong male that will father strong offspring. In fact, koalas produce a deeper sound than their body should be able to, due to special organs in their throat. *2
  • Why: Low notes travel further, so these males have a wider audience.

Fact #4. Koalas ovulate only after they have sex

Koalas don’t waste anything, not even eggs!  They are ‘induced ovulators’: an egg is released after sex and fertilised by stored sperm. *3

Induced ovulation is not uncommon in the animal world. Cats, rabbits and camels do it too.

Koala girls don’t have a period or monthly oestrus cycle.  They do it all in a rush, once a year, when sex is had and pregnancy is likely.

Imagine all that tension bottled up into one insane week per year.

The first Drop Bear (*4) was just a pre-menstrual female koala in a bad mood.

  • How: Hormones released in response to sex cause the ovary to release an egg, which is fertilised by stored sperm.
  • Why: It is suggested that it is good for animals with large home ranges who might have trouble finding each other at the right time. The female may also be able to choose not to ovulate, if the male didn’t treat her right. See next point.

Fact #5. The girls are in charge

The best way to explain this is through an analogy:

All year a lady koala will sit in her house as a happy single mother in her trackies, eating, watching TV and playing with her kid. But then October comes around, the weather improves, and the males start to sing to her. It awakens something. For another month she stays in her trackies watching TV, but she starts to think about doing her hair and going to the gym. By December she is fit and fine and ready for the town.

She packs her bags and goes on a little sex holiday. She can walk many kilometres. She goes straight to the house of the male she wants, sets herself up in the spare room and waits. She has no fear of being rejected – koalas are born gorgeous, and they know it.

The male eventually figures out she is there (he has a lot of spare rooms) and goes to her. He stands propped against the door (tree). Now he’s got her, he’s not letting her go.

Later that night he goes in the door (up the tree), singing. If she likes him, she won’t fight him – much. If she doesn’t like him she becomes vicious, slashing at his face with razor sharp claws.

I’ve watched several females fight off larger males. Lady koalas are not to be messed with.

Watch this rare footage of koalas mating in the wild:

When she’s finished with him, she goes home to her TV and her trackies, and soon to be baby.

Koalas are just so damn interesting! Can you ever look at them the same way again?

This is why Wild Koala Day is so important. The how and why of all this behaviour is best seen in wild koala populations, which are declining at shocking rates all over Australia. To keep them, we are going to have to act on protecting forest. Now.

So on May 3, Wild Koala Day:

PLANT a tree

PROTECT a forest

PHONE a politician

References:

*1. Johnson, S & Holt, W.  “The Koala (Phascolarctos cinereus): A Case Study in the Development of Reproductive Technology in a Marsupial” in Reproductive Sciences in Animal Conservation, (2014) Chapter 9 p. 175

*2. Charlton B (2011) quoted in Nature.com

*3. Ellis, W & Bercovitch, F. 2011 “Body size and sexual selection in the koala” in Behavioural Ecology & Sociobiology Vol 65 (2011) p. 1230

*4. Drop Bear: a fictitious predatory koala that drops onto unsuspecting tourists from above. see Wikipedia

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5 Amazing Facts about Koala Joeys

1. Baby koalas are called Joeys. All marsupial babies are called joeys – kangaroos, wallabies, wombats, tasmanian devils, possums & bilbys. The meaning/origin is unknown – it’s possibly just a diminutive used at that time for any small animal. Joey as a baby marsupial was first recorded in use in 1839.

The use of the word joey may have started with the word being applied for a British fourpenny coin. Politician Joseph Hume promoted the use of the fourpenny, thus the coin developed the slang name joey after him.

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2. The first time you see a koala joey it is already 6 months old. Koala joeys are born as tiny naked creatures that don’t look anything like a koala. They move straight into the pouch, and remain unseen until they emerge at around 6 months old.

Actual emergence takes time. The joey first pokes his head out of the pouch at 5.5 months, and fully emerges at 6 to 7 months. By 8 to 9 months the joey becomes too large to get into the pouch, and spends all his time on his mother’s belly or back.

3. Koalas invented pro-biotics. Koala joeys eat ‘pap’ – a special substance produced by their mother that looks like poo and acts like a probiotic. It contains gut flora that the joey needs to process eucalyptus leaves. The mother koala produces it from her caecum (a special chamber in her large intestine) and delivers it from her cloaca, so though it looks a bit like poo, its not.

Pap is absolutely essential to a koala’s health. Wildlife Carers with orphaned koala joeys will frequently ask the wildlife care community for a postal delivery of pap from a koala mother – any koala mother will do, the closer the better but any is better than none. Imagine receiving that package of squishy green slurry in the mail!

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4. Koala joeys are born out of their mother’s central vagina. Female koalas have three vaginas.

Why? Its complicated, and deserves a complete blog on the subject. Suffice to say that the two lateral (side) vaginae are for the passage of sperm to the uteri, and the median (central) vagina is for birth.

5. Koala joeys are born high in a tree. There is no danger of them falling to the ground – they are so tiny they get trapped in their mother’s fur. At birth a koala joey weighs only 1 gram – as much as a single sultana/raisin – and is only 2cm long.

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It’s Koala Joey Season in the state of Victoria right now. All over the state wild koalas can be seen with joeys – hotspots are The You Yangs near Melbourne, the Great Ocean Road and Raymond Island, East Gippsland.

Echidna Walkabout runs the following tours to see koalas in the wild – with a high chance of seeing koala joeys each year from September to November:

Wildlife Journey 4 days

Great Ocean Road 3 days

Koalas & Kangaroos IN THE WILD 1 day

For more information contact:

Janine Duffy

janine@echidnawalkabout.com.au

T: +61 (0)3 9646 8249

Echidna Walkabout Nature Tours & Koala Clancy Foundation

http://www.echidnawalkabout.com.au http://koalaclancyfoundation.org.au

Once seen, never forgotten. Koala of the Month: Cruiz

Its easy to assume that wild koalas have small, reliable home ranges. After all, you don’t see them moving about much do you?CRUIZ260913mrWMlowrestext

If we’ve learnt one thing over 17 years of wild koala research, its that koalas move! A lot!

We first met Cruiz in November 2008 in the Turntable region of the You Yangs. He looked big, strong and healthy. We assumed he was mature – at least 4 or 5 years old. It was exciting to have a new male on the block.

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But then he disappeared. Sadly, we filed his photos and nose pattern diagram under the “Koalas once seen, never to be seen again” file.

You should never give up on a koala, though. Out of the blue in December 2011 he re-appeared in the turntable area. He’s back, we thought. “Don’t be hasty” he thought.

We didn’t see Cruiz once in 2012. Not once. Back into The File he went.

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Cruiz in 2013

So when he showed up three times in 2013 and three times in 2014, we had learnt our lesson. We didn’t get excited. Maybe he’s a nomad. Maybe he’s in protracted negotiations with dominant male Anzac, and other residents Vincent, Zack, Kenny and Rocky.

But 2015 was a good year for Cruiz. Already we have seen him 12 times. He’s been all over the place – turntable, branding yard 2 km to the east, Branch Rd. If we simply join the dots of all his locations this year, his home range would be around 117 hectares!

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Interestingly, too, he isn’t migrating steadily from one area to another – he is regularly traversing that entire area. One day he’ll be in Branding Yard, a week later he’ll be back in Turntable.

He’s not young either – we estimate he is at least 12 years old. That’s a really good age for a wild male these days.

Every single wild koala is different. Cruiz is a special fellow.

If you come on our Koalas & Kangaroos IN THE WILD one day tour, or our 3 day Great Ocean Road tour, you might meet him!

Zack – wild koala of the month for October 2015

October #KoalaOfTheMonth is Zack!  Zack is very pugnacious and always a bit ahead of the game!!

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Zack is a young fellow with a lot of guts. He is pushing into dominant male Anzac’s home range – which no-one else has dared to do for years.  We are all so impressed with his courage, but worried for him as well!

wild koala Zack

Zack was first seen in October 2013.  We see a lot of young males moving around in spring each year. Most appear briefly, then disappear again, but Zack stuck around.  We’ve been seeing him on an off now for two years. We hope he can find a little home of his own near us!

wild koala Zack

Zack has a distinct, and obvious, unique nose pattern. Can you see the bright white patches in his nostrils and how they are similar both sides, but not quite the same?
Once you know a koala by their nose you’ll rarely mistake their identity, even if other features change.

wild koala Zack

When we first met Zack he looked like a 3 or 4 year old – chubby small face, big eyes, dark grey fur.

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Zack when we first met him, a 3 year old

Two years later, he is now a mature male and looks every bit of it – big, broad head, lighter dove grey fur, big shoulders.

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Zack in 2015, a mature 5 year old

If you are planning a trip to Melbourne, Australia, book the Koalas & Kangaroos IN THE WILD or 3 day Great Ocean Road tour for a chance to see Zack in person!

Watch out next Monday for November #koalaOfTheMonth Pat – mother of #KoalaClancy.

Bungaleenee: December 2014 #koalaOfTheMonth

This is #KoalaOfTheMonth: Bungaleenee. Whilst koalas are excellent at playing Hide and Seek, Bungaleenee is not playing that game here. He is sitting on the ground hugging the tree in an attempt to cool down. The tree trunk can keep his body temperature down by up to 7 degrees.

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Some people comment that Bungaleenee’s name sounds Italian (although not usually a comment made by Italians). In fact Bungaleenee is the name of an Aboriginal Man from the Gippsland area.

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Bungaleenee lives south of males #KoalaClancy and Gurren, and shares his home range with females Babarrang, Bermborok and Mear.

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It’s a well known fact that girl koalas are cuter than boy koalas (sorry guys). However if ever there was a big male who was a little better looking than others it would have to be Koala of the Month Bungaleenee!

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Next time you’re visiting Melbourne, Australia, come our on our Koalas & Kangaroos IN THE WILD tour and you might meet Bungaleenee!

A Miracle (Koala) Baby! The story of wild koala Misty

25th August 2015: While on Koalas & Kangaroos IN THE WILD tour Wildlife Guide Scott’s Whats App message came through to Echidna Walkabout Nature Tours base:
“K1 (Koala sighting 1) is Misty. K4 is her joey. Both high in a Yellow Gum. Joey is laying across her front”

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It was followed by a torrent of whoops, woohoos and thumbs up as our whole Koala Research and Wildlife Guiding team celebrated.

Every year we see koala joeys, so why was this one so special? To explain we have to go back to January 2014, to a week of terrible heat. Four consecutive days over 41C (105.8F). By January 18th, the fourth day, koalas were suffering.

This photo was taken 18th January 2014 and shows the first time we met Misty. She was not a happy koala.

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This poor young girl was sitting miserably in a waterhole. And she wasn’t the only one – six other koalas were on the ground over those four days, and another six were sitting in the lower third of their trees. This is an unusually high incidence of ground and low roosting.

Misty was found at 9.45am that day, sitting with her feet in the waterhole. She was checked five times over the next five hours and she barely moved. I came past at 2pm with a lovely group of people on a Koala Conservation Day for Locals. I was shocked by her look of hopelessness.

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On this occasion I did something I would not normally do: I asked my volunteers to wait in the car, and I approached Misty with a water spray while they watched. I was hoping that my approach would make her spark up and climb a tree. It didn’t, and that’s when I really knew she was in deep trouble.

A wild koala does not welcome a close approach by a human unless they are severely injured or so heat-stressed they are in danger of dying. Basically, their knowledge of impending death is so great that their fear of humans is cancelled out.  Misty was at Stage 5 of the Koala Heat Stress Scale – read about that here: When does a hot koala need help?

So when you see that beautiful photo of Sam the koala being given water by the firefighter – don’t see an appreciative wild animal being helped by a person. See a dying animal that has no choice.

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I sprayed the full bottle of water on her, standing back as far as I could and all she did was put her head up. I called Donna from Lara Wildlife Shelter and asked if she could take her into care.

My beautiful volunteers were absolutely quiet and didn’t leave the car all this time. I bet the iPhones and cameras were working overtime!

Misty stayed in care with Donna for 10 days. In that time she was weighed, thoroughly vet checked, and assessed to have nothing wrong with her. I was surprised – could a healthy young koala really be brought so low by a heatwave? Other, older koalas were still alive through this heatwave, without our help. But, interestingly, one joey was looking a bit flat too – maybe it is hard on the young?

She was released to the place she was found, healthy and well, late on 28th January 2014.

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Throughout 2014 and 2015 we have seen Misty on and off. At first, she stayed near the little waterhole. Later she was seen moving close to Nova and Elizabeth’s home area. We were thrilled that she was staying around and looking so well!

Then suddenly, in August this year, we got that beautiful message from Wildlife Guide Scott:

“K1 is Misty. K4 is her joey. Both high in a Yellow Gum. Joey is laying across her front”

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Not only has Misty survived her ordeal, she has thrived. She has done the greatest thing of all for koala conservation – she has produced the next generation. And we’ve been part of that.

We are very proud ‘grandparents’.

 

Update 2017: Misty’s first joey Lluvia, a male, thrived, and became independent at around one year old.  In July 2016 Misty’s second joey, Cuddles, a female, emerged from her pouch.  At January 2017 Cuddles is still with Misty but becoming increasingly independent.

Emma – Wild Koala of the month for August 2015!

August Koala of the month is Emma!

This dear little lady has been a friend since 29th March 2006 – can you believe that? 9.5 years!  Emma has been delighting international travellers for nearly 10 years.  Aren’t we lucky to know her?

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We are not sure exactly how old she is, but in 2006 we thought she looked around 3-4 years old.  That would make her at least 12 or 13 years old now.

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Emma has always been a small female, and has never been seen with a joey.  Though that sounds surprising, its not.  A high proportion of our wild females never raise a joey.  Of eleven females currently living in our main research area, only three have ever been seen with joeys.  A few of those females are new, so may produce young, but this has been the pattern over all of our 17 years of koala research, both in the You Yangs and Brisbane Ranges.

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We are not sure of the reason, but we can’t just assume its chlamydia.  Though the You Yangs & Brisbane Ranges populations are Chlamydia-positive, the disease rarely manifests in any way we can see.  Chlamydia could be the cause, but it could be something else.  Or it could be normal for koalas to have a low birth rate in these habitats.

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It doesn’t matter to us whether she is a mother or not – she is a valuable member of the koala community and we love her!