Be noisy as hell
Stop that, stop that! Go on, clear off! Go on, go away! And you, clear off! Bloody weather.
Bloody weather...
quakey
Circles in the glass of water intensify.
I'd love to see an informed response as to why we think they ran instead of hopped. Is there a difference in the skeleton or muscles that would tell us?
They were all made in clay-rich sandstone, which preserved the tracks so well that they have impressions of the scales on the skin of these dinosaurs.
Oooo so we know for sure what the scale shapes are? Fascinating! Where is dino science on feathers currently? Did some dinosaurs resemble birds more than lizards? Sorry I'm late. Be wild if we had such impressions of feathers somewhere
Likely footprint patterns
Good point actually.
Kangaroos hop because they can store a lot of energy in there Achilles tendon and use that to propel them forward without using much energy. It's good for covering long distances over flat terrain while using as little energy as possible , which is good for the Australian outback as they hop between small patches of vegitation separated by miles of desert. It's not that good for ambushing or quickly chasing prey in a rainforest like the t rex is probably doing.
There's also the issue of scale, a t rex's Achilles tendon would have to be stronger then steel cable and as stretchy as rubber to store and re use that much kinetic force from its weight.
Probably something to do with strain on the body. Studies show T. rex couldn't even run. Maybe a fast walk. Additionally, the way the muscles attach to the bones probably don't support hopping.
Most likely the weight difference would be the biggest issue here.
Same reason why to scale bug wings wouldn't let you fly, that square cube law can lead to some very unfun conclusions where big beasties are concerned.
Or some absolutely terrifying ones in Shin Godzilla's case.
Skull weight alone would make hopping difficult. Their heads are huge.
yep, the first thing I noticed was how tiny the kangaroo's head and upper body is compared to the legs. for the t-rex both the head and the upper body are much more massive compared to the leg's diameter.
Maybe they tucked their huge heads and rolled around like rollerrats. Except huge.
first off AFAIK they don't even have anything near the amount of muscle in the right places to try hopping, but even if they did manage it i'm pretty sure their legs would snap in half when they landed and then as the rest of the body met the ground they'd crack ribs and stuff as well.
Imagine trying to jump around while wearing a dishwasher on your back, even if you're monstrously strong in every part of your body it's gonna fucking suuuuuuuuck
I've seen a lot of little birds hop around. Not only are birds dinosaurs, but the particular birds I've seen hopping are very similar in shape to a T Rex.
My chickens run around very similar to the run we see of T-Rex/raptors in movies. They lean forward and low and run surprisingly fast for an animal with wings that they just tuck.
Yeah, that seems more likely from what I know about dinosaurs. Just saying, we already have birds who hop to compare to. The kangaroo idea just strikes me as silly
I’ve watched scrub jays running around on my lawn, eating bugs, looking exactly like little dinosaurs.
And what if they skipped daintily while holding giant lollipops?
"Nurse said that if I were a good lad that I should receive a lolly!"
I think I saw that anime.
T Rex only known organism to lick its way to the center of a Tootsie pop
The math maths
Imagining a TRex with enormous bunny-shaped ears
Does the penguin fly? Mass/per/volume is a thing...
Mass per volume is density, and I suspect the Trex and kangaroo are similar (~1000 kg/m^3) so yes they'd both bounce in that case. I think what you're looking for is surface area to volume, which decreases rapidly as an object gets larger while maintaining geometry.
It's worth noting that most extinct dinosaurs were probably more similar to surviving ones (i.e., birds) than to mammals and reptiles when it comes to bones and respiratory systems, and, by extension, density.
That is to say, they probably could get that big because they were quite literally full of air.
Some of them (especially sauropods, but maybe also other big species like tyrannosaurs) probably had even more complex and efficient air sac systems than modern birds...
+1 Terrifying
They absolutely did.
