Coastal News

Health & Wellness

Carnivorous animals come in all shapes and sizes, from the 500-gram quoll to the 500-kilogram polar bear. This disparate group of mammals shares a common feature: canine teeth at the front of their jaws.

Canine teeth are long and pointed, with a sharp tip and, in some cases, bladed edges. These fearsome weapons are what make carnivores such effective killers. In fact, our new research out today reveals how evolution has shaped canines into unique forms to suit each predator’s way of life.

We applied state-of-the-art 3D methods to measure the canine teeth of more than 60 predators including lions, cheetahs, grizzly bears, dingoes and Tasmanian devils. The research represents the first comprehensive analysis of canine tooth shape in predatory mammals.

We discovered canine teeth have evolved in special ways to help each species kill and eat their favourite prey – helping to make mammals some of nature’s most successful predators.

how the canine teeth of carnivorous mammals evolved to make them super-killers A lion, meerkat, grizzly bear, and African wild dog bearing their canine teeth. Lion Petr Ganaj, meerkat Joshua J. Cotten, grizzly bear mana520, African Wild Dog Matt Burke all via Unsplash

Born to kill

When carnivorous mammals snarl, they reveal four long canine teeth at the front of their jaws - two at the top and two at the bottom. These teeth are the first point of contact between predator and prey, and are used to stab, kill and dismember a catch.

Not all carnivores have the same diet. Grizzly bears eat meat, fruit and plants, while meerkats feed mostly on invertebrates like scorpions and beetles. Big cats, like cheetahs, stick to meat.

Carnivores can also kill in myriad ways. Tigers suffocate their prey with a targeted throat bite, while wolves use multiple slashing bites to tear apart their prey. Small canids such as the red fox snap up and violently shake their prey, while wolverines can kill with a single, crushing skull bite.

There’s been little research into the associations between canine tooth shape, function and evolution. Our research sought to determine what canine shapes are best for each predator diet.

Read more: New research reveals animals are changing their body shapes to cope with climate change

how the canine teeth of carnivorous mammals evolved to make them super-killers Lion using its long sharp dagger-like canines to deliver a targeted neck bite and taking down an Oryx in the Kalahari Desert. Lion canines Mike van den Bos and hunting Thomas Evans both via Unsplash

A bite worse than its bark

We scanned and compared the canine teeth of more than 60 carnivores, including tigers, coyotes, polar bears, wolverines, raccoons and even quolls. We then looked at the association between canine shape and function.

We found tooth shape varies depending on the types of food a carnivore regularly bites into – just like we choose different kitchen knives depending on what we want to cut up.

Big cats such as lions, tigers and cheetahs have some of the sharpest canine teeth in the animal kingdom. These long, dagger-like weapons are used to stab – biting down deeply into the throats of prey to bring them down.

Take a 3D look at the canine teeth of a cheetah in the interactive below.

Other species, such as the coyote and red fox, have slender, curved canines. These teeth act as hooks to help hold small prey and prevent it slipping from the mouth when shaking.

Animals that eat a lot of “soft” prey, or those that deliver throat bites, often have sharp, slender canines. The sharp tips make a crack in the prey and as the animal bites down, the long, sharp edges of the tooth help penetrate deeply into the catch.

Species with a tougher or more varied diet have stout, robust teeth that don’t break when crunching bone or other hard foods. These species include scavengers such as the Tasmanian devil, and generalists such as the honey badger.

The bluntest upper canine tips we examined belong to the crab-eating mongoose. As the name suggests, the species feeds on crabs and other hard prey such as reptiles, snails and insects.

We also found canine teeth with blunt tips and edges were found in animals that kill prey with crushing bites to the skull, such as the American martin or wolverine. Blunt tips are better able than sharp tips to withstand the stresses produced by such heavy force.

how the canine teeth of carnivorous mammals evolved to make them super-killers Canine teeth can be long and sharp, slender and curved, or blunt and robust. These differences relate to how these teeth are used during hunting and feeding. Image by Tahlia Pollock

Something to chew on

The research helps establish new links between tooth shape and ecology that may shed light on the diet and behaviour of extinct species.

For example, the thylacine (or Tasmanian tiger) had curved canines, which suggests it may have snapped up and shaken smaller prey. This supports recent research on thylacine skull shape which found that, contrary to previous theories, the thylacine likely hunted small rather than large prey.

By studying canine teeth up close, we’ve discovered just how well evolution shaped even the smallest animal features to suit the niches they fill in nature.

Read more: Who would win in a fight between a wedge-tailed eagle and a bald eagle? It's a close call for two nationally revered birds

Authors: Tahlia Pollock, PhD candidate, Monash University

Read more

4 Best Beaches in Australia

If you have been feeling tired, distressed, or overwhelmed lately, maybe it’s time to escape the hustle and bustle of the city for a while. The ...

How to Find Australia’s Best Fishing Destinations

It is not a secret that Australia is legendary for its fantastic fishing spots. Not only is Australia home to impressive turquoise waters, but it is...

7 Tips To Finding The Right Conveyancing Solicitor

A conveyancing solicitor is a lawyer who specializes in the drafting of contracts of sale, exchange, mortgage or lease of land. They are responsib...

10 things new pool owners must know

A pool is an excellent addition to your backyard, but it also comes with its own set of challenges. Pool ownership is not just about owning a pool...

4 Ways Technology is Changing Pool Care

Owning a swimming pool is exciting on so many levels. When the temperature gets high during summer, that’s mainly the time you’ll appreciate p...

4 Top Australian Luxury Destinations

Australia boasts of attractions sites that make it a hotspot for adventure and lots of sightseeing experiences. For this reason, Australia holds l...

4 Hidden Gems in Sydney

Sydney- a city, situated in between the land and sea, presenting you the seductive intermingling vibes- is one of the biggest and most beautiful c...

Places to Visit in Queensland

In all the states in Australia, Queensland is one of the most tropical among them. There are a variety of beaches to choose from and islands that ...

The Most Famous Coastal Roads in Australia

Over 17,000 miles of coastline on the mainland and 10,000 miles on the islands makes Australia ideal for ocean-view road trips. While driving acro...

7 Road Trip Ideas for the Coast of Australia

Beaches in Sydney are not only for those who love to surf and swim. Those beautiful beaches can also be used by people who love road-tripping alon...

Things to do in Cairns

The city of Cairns is categorized as one of the most historical places in the country mainly because of the Tjapukai Aboriginal Cultural Park that s...

10 Ways How Video Marketing Can Grow Your Travel Business

Do you know that a human brain can remember a video more than a piece of text? Our minds can retain more than 90% of the information after watchin...

How to Embrace Winter in Western Australia (Top Tips and Getaways)

During winter in Australia, it can freeze and snow in the south while the north can have sunny days and cool nights. During winter, you can visit ...

7 Best Adults-Only Travel Spots in Australia

Whether you have children or not, sometimes it's great to escape the pitter-patter of small feet for a few days to re-energize. The best way to do...


Few Things To Know Before Choosing Cheap Veneers in Sydney

Do you know that a beautiful smile can enhance the quality of life? These days, you can easily see on social media the smiling pic...

Sedation Dentistry Guide

Are you someone who gets very anxious just thinking about having to sit in a dentist's chair? If so, then you will probably pu...

All You Need To Know About Dentures

There are many reasons that people may need dentures. It can be caused by aging, injuries, or lack of dental care over the y...

Writers Wanted

Content & Technology Connecting Global Audiences

More Information - Less Opinion