«Breaking News» Prehistoric dogs hunted in the same way as modern-day foxes

The largest dog to ever live was the size of a grizzly bear and hunted in the same way as a modern-day fox, scientists have found. 

Epicyon haydeni lived 16 million years ago and researchers have found it is related to the very first species of dog, known as Hesperocyon gregarius.

Both these canines pounced on prey in the same way that species such as foxes and coyotes do today, CT scans revealed.

They discovered this by carefully analysing the skulls of a group of mammals known as carnivorans, which includes modern-day foxes, wolves, cougars and leopards.

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Researchers found that the very first species of dog, known as Hesperocyon gregarius (CT scan pictured), pounced on its prey in the same way that species such as foxes and coyotes do today.  The largest dog to ever live also hunted in the same way

Scientists at the universities of Edinburgh and Vienna used computerised scans of fossils and modern animals to create digital models of the inner ears of 36 types of carnivoran, including six extinct species.

Experts found that the size of three bony canals in the inner ear, the organ that controls balance and hearing, changed over millions of years as animals adopted different hunting styles.

Faster predators – such as cheetahs, lions and wolves – developed large ear canals that enabled them to keep their head and vision stable while chasing prey at speed, the team said.

According to the research, the inner ear structure indicates whether a species descended from dog-like animals or animals resembling cats.

A distinctive angle between two parts of the inner ear is much larger in dog-like animals, the team found.

Experts found that the size of three bony canals in the inner ear, the organ that controls balance and hearing, changed over millions of years as animals adopted different hunting styles. A distinctive angle between two parts of the inner ear is much larger in dog-like animals (CT scan pictured)

The study is based on research carried out by Edinburgh PhD student Julia Schwab during studies in Vienna.

Ms Schwab, of the University of Edinburgh's School of GeoSciences, said: 'For me, the inner ear is the most interesting organ in the body, as it offers amazing insights into ancient animals and how they lived.

'The first dog and the largest-ever dog are such fascinating specimens to study, as nothing like them exists in the world today.'

The study has been published in the journal Scientific Reports.

WHAT IS A COMPUTED TOMOGRAPHY (CT) SCAN?

Computed tomography (CT) scans use an x-ray beam to produce cross-sectional images of an object.

They are used in medical settings to peer inside the human body, as well as in scientific research to examine artefacts without damaging them.

When the imaging process is taking place, the x-ray tube continuously emits an x-ray beam and is rotating in a 360 degree circle in a device called a gantry.

While this is happening, the patient or object is placed on a special CT imaging table that lets the x-ray beam pass through. 

The x-ray beam is shaped similar to a hand-held fan and is often described as a fan beam.

There are multiple digital detectors located within this circular gantry that continually identify the energy of the x-ray photons that exit the object or person.

The motion of the table moving through the gantry allows images to be reconstructed as slices (or tomographs).

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https://hienalouca.com/2019/01/11/prehistoric-dogs-hunted-in-the-same-way-as-modern-day-foxes/
Main photo article The largest dog to ever live was the size of a grizzly bear and hunted in the same way as a modern-day fox, scientists have found. 
Epicyon haydeni lived 16 million years ago and researchers have found it is related to the very first species of dog, known as Hesperocyon gregarius.
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