The Biggest Bouncer: Unveiling the World's Largest Kangaroo

male eastern grey kangaroo
Eastern grey kangaroos, the second largest species of kangaroos, are known for their impressive size and agility.

Hop to It: Introducing the Red Kangaroo

A female red kangaroo carrying her joey in her pouch.
A female red kangaroo carrying her joey in her pouch.

When it comes to kangaroo size, the red kangaroo takes the crown. These impressive marsupials, found in the Australian outback, are the largest of all kangaroo species. They can grow up to a whopping 2.2 meters (7.2 feet) tall when standing upright. That's taller than most humans!

A large male red kangaroo standing in the Australian desert.
A large male red kangaroo standing in the Australian desert.. Source: dnatheist, CC BY 2.0 (modified)

But it's not just their height that's impressive. Red kangaroos can leap up to 9 meters (30 feet) in a single bound and reach speeds of 70 km/h (43 mph). Talk about some serious jumping power!

Battle of the Sexes: Male vs. Female Kangaroos

A male eastern grey kangaroo grazing in Murramarang National Park
A male eastern grey kangaroo grazing in Murramarang National Park

Here's an interesting tidbit: male kangaroos are significantly larger than females. This size difference, called sexual dimorphism, is common in many species. Male red kangaroos can be twice the size of females and sport much more muscular builds.

While male red kangaroos can reach heights of 1.4 to 2.2 meters (4.6 to 7.2 feet), females top out at a more modest 0.8 to 1.1 meters (2.6 to 3.6 feet). So if you spot a particularly beefy kangaroo, chances are it's a male.

Record-Breaking Roos: The Guinness World Record Holder

Want to know about the biggest kangaroo ever recorded? The Guinness World Record goes to a male red kangaroo that measured a staggering 2.5 meters (8.2 feet) in body length and stood about 1.8 meters (5.9 feet) tall. That's one oversized marsupial!

Roger: The Famous Muscular Marsupial

You might have heard of Roger, a red kangaroo that became an internet sensation. This musclebound marsupial stood 2 meters (6.5 feet) tall and weighed an impressive 91 kg (200 lbs). Roger lived at a sanctuary in Alice Springs and passed away in 2018 at the age of 12, but not before cementing his place in kangaroo fame.

A Blast from the Past: The Largest Kangaroo Ever

procoptodon goliah
Illustrations of Procoptodon goliah. Sources: Left (Apokryltaros at English Wikipedia, CC BY 3.0); Top right (Nobu Tamura, CC BY 3.0); Bottom right (Nobu Tamura, CC BY-SA 4.0)

If you think modern kangaroos are big, wait until you hear about their ancient relatives. The largest kangaroo species to ever exist was Procoptodon goliah, which lived during the Pleistocene epoch. These giant kangaroos stood about 2 meters (6.5 feet) tall and could weigh up to a massive 240 kg (530 lbs)!

Procoptodon goliah went extinct about 45,000 years ago. While they weren't much taller than today's red kangaroos, they were significantly heavier and more powerful. These ancient giants could even reach branches up to 3 meters high with their long limbs!

So there you have it – the lowdown on the largest kangaroos, both past and present. From the mighty red kangaroo to the prehistoric Procoptodon goliah, these Australian icons continue to captivate us with their impressive size and incredible abilities.