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Demystifying the Strange Beauty of the Proboscis Monkey’s Large Nose
Of all the #monkey species around the world, one stands out with its large, bizarre nose. In male proboscis monkeys, their bulbous noses will often hang past their mouths.But why did they evolve such a strange feature? Are they a visual sign of health and status to potential female mates, and to other males? Or did they evolve to help the monkeys make honks and other loud sounds? New groundbreaking #research has much to reveal about the mysterious large nose of the Proboscis Monkey!
Fascinating and oddly beautiful Proboscis #Monkeys of #Malaysia #Indonesia, have webbed feet and live in harems. Now #researchers discovered why they have such long noses! Help them survive when you #BoycottPalmOil #Boycott4Wildlife @palmoildetect https://wp.me/pcFhgU-5G6
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Gentle Proboscis #Monkeys of #Borneo are famous for their long noses. Until recently the reasons why baffled scientists, not anymore! They’re threatened by #palmoil #deforestation. You can help when you Boycottpalmoil #Boycott4Wildlife @palmoildetect https://wp.me/pcFhgU-5G6
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Written by Katharine Balolia, Senior Lecturer in Biological Anthropology, Australian National University The author would like to acknowledge the paper’s co-author, former ANU Masters student Pippa Fitzgerald. This article is republished from The Conversation under a Creative Commons license. Read the original article.
In our new study, published in Scientific Reports, we have deepened our understanding of these enlarged nasal structures by investigating what lies beneath: the structures in the skull.
Our findings help to explain how these noses function as visual and acoustic signals of health and status. They also add to a growing body of evidence that shows researchers can use close examinations of skulls to glean information about primate social behaviour.
A battle of noses
One of the largest monkey species in Asia, proboscis monkeys (Nasalis larvatus) are endemic to the island of Borneo. They live in coastal mangroves, peat swamps and riverine forests, and have an unusual diet made up mostly of leaves.
They can swim quite well and have webbed fingers and toes. They typically live in harem groups, made up of a single adult male (who tends to have a large, bulbous nose), some adult females and their offspring.
Males don’t often get the opportunity to attract a harem until they reach middle age. These older, dominant and large-nosed males don’t easily tolerate other large-nosed males, often trying to ward them off aggressively with deep honks and “nasal roars” – loud calls they make using their noses.
Young adult males with smaller noses often live in all-male bachelor groups, and don’t tend to fight aggressively with each other. When these bachelor males get older and become large (and large-nosed) enough to compete with males that are part of a breeding group, they are in a position to overthrow the tenured male. Females then often choose to form a harem group with this new, high-status male.
What’s behind the nose?
We investigated the size and shape of the proboscis monkey nasal cavity. That’s the bony chamber of the skull that sits behind the fleshy nose. Our goal was to find out if the size and shape of the nasal aperture – the front part of the cavity, where the fleshy nose tissue attaches – can tell us more about why these peculiar appendages evolved.
Previous research that looked at the bulbous nose in males suggests it evolved to advertise status. In our new research, we wanted to better understand how this could be the case, this time using data taken from the skull.
We used 3D surface models, downloaded from a public repository, to take size and shape measurements from 33 adult proboscis monkey skulls. We compared these with the adult skulls of king colobus monkeys, blue monkeys and crab-eating macaques, three old world monkey species.
We chose some measurements to quantify the nasal cavity, and others to quantify the nasal aperture in all the species. We also looked at tooth wear, since older adult monkeys have more worn teeth than younger adults. That would allow us to find out if older adult males had a larger nasal aperture than younger adult males.
Better honks
If male proboscis monkeys have a different nasal cavity shape to females, and a unique shape compared to the other monkey species, it would support the idea these enhanced nasal structures – both the fleshy nose and the cavity behind it – evolved to allow for more effective honks and nasal roars.
That was indeed what we found. The shape of the male nasal cavity was low and long compared to females. This allows males to build up resonance (sound vibration) in their nasal cavities, allowing them to emit deeper and louder calls through their noses.
The nasal aperture shape was also different between the sexes. In males, it looks a bit like an eggplant, while in females it looks more like an upside-down pear. This unique opening shape in males allows for higher intensity sounds to be emitted through the nose.
The sex differences in cavity shape were also larger than what we found in other old world monkey species. This further supports the idea that the nasal cavity of male proboscis monkeys underwent an evolutionary change for the purpose of making certain sounds.
Lastly, the age. Older proboscis monkey males really do have larger nasal apertures than younger adult males, but the cavity itself didn’t increase with age. This supports the idea that the large noses act as a visual signal. It’s also consistent with the fleshy nose size increasing in middle-aged or older adult males, which we know from behavioural studies in the wild.
Our evidence from the skull allows us to better understand how nasal structures in male proboscis monkeys evolved for both acoustic and visual signalling.
The more we know about how regions of the skull function as social signals, the better chance we have of reconstructing extinct primate social behaviour using fossilised skull remains.
Written by Katharine Balolia, Senior Lecturer in Biological Anthropology, Australian National University The author would like to acknowledge the paper’s co-author, former ANU Masters student Pippa Fitzgerald. This article is republished from The Conversation under a Creative Commons license. Read the original article.
ENDS
Learn about other animals endangered by palm oil and other agriculture
Global
South America
S.E. Asia
India
Africa
West Papua & PNG
Sunda Clouded Leopard Neofelis diardi
Glaucous Macaw Anodorhynchus glaucus
Attenborough’s Long-Beaked Echidna Zaglossus attenboroughi
Nancy Ma’s Night Monkey Aotus nancymaae
Maned Wolf Chrysocyon brachyurus
Tufted Ground Squirrel Rheithrosciurus macrotis
Learn about “sustainable” palm oil greenwashing
Read more about RSPO greenwashing
Lying
Fake labels
Indigenous Land-grabbing
Human rights abuses
Deforestation
Human health hazards
A 2019 World Health Organisation (WHO) report into the palm oil industry and RSPO finds extensive greenwashing of palm oil deforestation and the murder of endangered animals (i.e. biodiversity loss)
Take Action in Five Ways
1. Join the #Boycott4Wildlife on social media and subscribe to stay in the loop: Share posts from this website to your own network on Twitter, Mastadon, Instagram, Facebook and Youtube using the hashtags #Boycottpalmoil #Boycott4Wildlife.
2. Contribute stories: Academics, conservationists, scientists, indigenous rights advocates and animal rights advocates working to expose the corruption of the palm oil industry or to save animals can contribute stories to the website.
Wildlife Artist Juanchi Pérez
Mel Lumby: Dedicated Devotee to Borneo’s Living Beings
Anthropologist and Author Dr Sophie Chao
Health Physician Dr Evan Allen
The World’s Most Loved Cup: A Social, Ethical & Environmental History of Coffee by Aviary Doert
How do we stop the world’s ecosystems from going into a death spiral? A #SteadyState Economy
3. Supermarket sleuthing: Next time you’re in the supermarket, take photos of products containing palm oil. Share these to social media along with the hashtags to call out the greenwashing and ecocide of the brands who use palm oil. You can also take photos of palm oil free products and congratulate brands when they go palm oil free.
https://twitter.com/CuriousApe4/status/1526136783557529600?s=20
https://twitter.com/PhillDixon1/status/1749010345555788144?s=20
https://twitter.com/mugabe139/status/1678027567977078784?s=20
4. Take to the streets: Get in touch with Palm Oil Detectives to find out more.
5. Donate: Make a one-off or monthly donation to Palm Oil Detectives as a way of saying thank you and to help pay for ongoing running costs of the website and social media campaigns. Donate here
#animalBehaviour #AnimalBiodiversityNews #animalCommunication #animalIntelligence #animalRights #Borneo #Boycott4wildlife #BoycottPalmOil #deforestation #Indonesia #Malaysia #monkey #monkeys #PalmOil #palmOilDeforestation #palmoil #ProboscisMonkeyNasalisLarvatus #research #Researchers #SouthEastAsia
King Colobus, Colobus polykomos | New England Primate Conservancy
The king colobus (Colobus polykomos) is native to the tropical lowland and montane rainforests on the western coast of Africa, from Gambia to Côte d’Ivoire.New England Primate Conservancy
Beyond Cute: All Animals Can Become Social Media Sensations
In the age of cutesy #mammal sensations like pygmy hippo #MooDeng the chubby, pink-cheeked pygmy #hippo baby – many people believe that social media shares are correlated to cuteness. They are wrong, according to a recent study, more obscure and unusual animals like #insects, #amphibians, #reptiles and #insects can enjoy a generous portion of the social media limelight. Help them every time you shop and #BoycottPalmOil #Boycott4Wildlife
Cutesy #animals like #MooDeng🦛 the chubby-cheeked pygmy #hippo lead many to believe #socialmedia shares are correlated to #cuteness – they’re wrong. All animals can enjoy the spotlight Protect them when u #Boycott4Wildlife #BoycottPalmOil @palmoildetect https://wp.me/pcFhgU-974
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Cutesy or not: animals can be showcased on social media with the right storytelling and still gain big audience engagement
Remember the popularity contests of high school? Often our athletic, genetically gifted classmates got the most attention: the school captain, the footy team captain, the prom queen. But popularity contests don’t just exist in school. And in the world of conservation, it can be a matter of survival for the “winners” and “losers”.
If we asked you to list every animal species you can think of, chances are that list would be full of mammals and birds, with very few reptiles, fish, amphibians and invertebrates. So why do we focus so much on some species and so little on others?
Our recent study challenges assumptions that people simply find mammals and birds much more engaging than other species. When these neglected species were posted to Instagram by wildlife organisations and researchers, there were no great differences in the likes they attracted.
This has implications for which species we focus on to enlist public support for conservation. A more complete picture of the wildlife around us would help reduce glaring imbalances in conservation outcomes.
Our cognitive bias towards the cutest and fluffiest
For years, we’ve assumed humans engage more with the “cute and fluffy” species – often known as “charismatic megafauna” – and these are the animals that are shown to us on TV, film and advertising. There is evidence to support this preference. People will often choose to donate to mammals and birds over other species, and mammals and birds are mentioned more on social media.
However, mammals and birds make up less than 10% of all animals on Earth. With the media we’re consuming, we’re just not getting an accurate picture of the world of wildlife that surrounds us.
Where this gets worrying is in the fight for species survival. Our planet is in an extinction crisis, with species becoming extinct at extraordinary rates.
However, our focus on mammals and birds means cute and fluffy animals receive more research attention and funding. Conservation outcomes for these species are better than for reptiles, amphibians and invertebrates. Tellingly, 94% of all threatened species on the IUCN Red List are reptiles, fish, amphibians and invertebrates.
Do people really prefer charismatic megafauna?
Our study suggests this issue may be more complex than first thought. Many Australian conservation organisations use social media platforms, such as Instagram, to share their work and connect communities with wildlife. But in the busy, ever-updating world of Instagram feeds, which images are the most effective at grabbing someone’s attention?
We set out to examine which Australian wildlife species were most often posted to Instagram and which had the highest levels of engagement. Based on the belief that people will engage more with charismatic megafauna, we expected mammals and birds to be shown more frequently and to elicit higher engagement than the “creepy crawlies” such as amphibians and insects.
We analysed 670 wildlife images posted to Instagram by wildlife organisations and research group accounts in 2020 and 2021. For each image, we noted the species posted in the image. As a measure of engagement, we recorded the number of “likes” the image received in proportion to each organisation’s follower count.
What did the study find?
Our results were surprising and provide hope for the future of underrepresented wildlife.
Although the majority of wildlife images posted to Instagram by these conservation organisations were of mammals and birds (73.7% to be precise), our analysis of image engagement uncovered a surprising and promising trend. Mammals were, indeed, more engaging than other species, but only by a tiny amount. We found birds, reptiles, invertebrates, amphibians and fish were all equally as engaging for Instagram users.
Are we ready to sympathise with weird bugs?
Perhaps it is time to give our creepy crawlies more of the media limelight. The more we see a wide diversity of animals, the more likely we are to support their conservation.
The Theory of Repeated Messaging suggests when we are repeatedly exposed to something, we are more likely to become familiar with, engage with and support it. Research has shown when we put effort into promoting underrepresented species, we can improve their chances of receiving a public donation by 26%.
Our findings suggest the media and conservation organisations can promote endangered species across all walks of life – from lizards to bugs and fish to frogs – without compromising viewer engagement. This will increase our knowledge of the amazing diversity of animals that we share this planet with. In turn, this will lead to underrepresented species receiving more of the conservation support they need to survive.
Zoos Victoria is already leading the way. The endangered native golden-rayed blue butterfly features in the new Totes for Wildlife campaign to conserve its natural habitat.
Perhaps we tend to prefer mammals and birds because we see them more, and not just because they look a certain way. After all, beauty is in the eye of the beholder.
Written by Meghan Shaw, PhD Student in Conservation Social Science, Deakin University; Bill Borrie, Associate Professor, Environmental Management and Sustainability, Deakin University; Emily McLeod, Senior Social Science Research Manager, Zoos Victoria, and PhD Candidate, The University of Queensland, and Kelly K Miller, Associate Professor of Environment and Society, Deakin University This article is republished from The Conversation under a Creative Commons license. Read the original article.
ENDS
Learn about other animals endangered by palm oil and other agriculture
Global
South America
S.E. Asia
India
Africa
West Papua & PNG
Sunda Clouded Leopard Neofelis diardi
Glaucous Macaw Anodorhynchus glaucus
Attenborough’s Long-Beaked Echidna Zaglossus attenboroughi
Nancy Ma’s Night Monkey Aotus nancymaae
Maned Wolf Chrysocyon brachyurus
Tufted Ground Squirrel Rheithrosciurus macrotis
Learn about “sustainable” palm oil greenwashing
Read more about RSPO greenwashing
Lying
Fake labels
Indigenous Land-grabbing
Human rights abuses
Deforestation
Human health hazards
A 2019 World Health Organisation (WHO) report into the palm oil industry and RSPO finds extensive greenwashing of palm oil deforestation and the murder of endangered animals (i.e. biodiversity loss)
Take Action in Five Ways
1. Join the #Boycott4Wildlife on social media and subscribe to stay in the loop: Share posts from this website to your own network on Twitter, Mastadon, Instagram, Facebook and Youtube using the hashtags #Boycottpalmoil #Boycott4Wildlife.
2. Contribute stories: Academics, conservationists, scientists, indigenous rights advocates and animal rights advocates working to expose the corruption of the palm oil industry or to save animals can contribute stories to the website.
Wildlife Artist Juanchi Pérez
Mel Lumby: Dedicated Devotee to Borneo’s Living Beings
Anthropologist and Author Dr Sophie Chao
Health Physician Dr Evan Allen
The World’s Most Loved Cup: A Social, Ethical & Environmental History of Coffee by Aviary Doert
How do we stop the world’s ecosystems from going into a death spiral? A #SteadyState Economy
3. Supermarket sleuthing: Next time you’re in the supermarket, take photos of products containing palm oil. Share these to social media along with the hashtags to call out the greenwashing and ecocide of the brands who use palm oil. You can also take photos of palm oil free products and congratulate brands when they go palm oil free.
https://twitter.com/CuriousApe4/status/1526136783557529600?s=20
https://twitter.com/PhillDixon1/status/1749010345555788144?s=20
https://twitter.com/mugabe139/status/1678027567977078784?s=20
4. Take to the streets: Get in touch with Palm Oil Detectives to find out more.
5. Donate: Make a one-off or monthly donation to Palm Oil Detectives as a way of saying thank you and to help pay for ongoing running costs of the website and social media campaigns. Donate here
#amphibians #animal #animalBehaviour #AnimalBiodiversityNews #animalCommunication #animalCruelty #animalExtinction #animalIntelligence #animalRights #animals #biodiversity #Boycott4wildlife #BoycottPalmOil #cuteness #deforestation #hippo #insects #Mammal #MooDeng #PalmOil #palmOilDeforestation #PygmyHippopotamusChoeropsisLiberiensis #reptiles #socialmedia #study #vegan
If You Love Moo Deng, Help to Save Her Home!
Moo Deng, the chubby, moody and adorable baby pygmy hippo has highlighted the plight of these elusive large mammals living in Africa’s rainforest and mangrove environments. The message to ani…Palm Oil Detectives
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