Dave Hone

They get more compression from the landing, meaning they get more spring.

And how fast does it move?

So this is one of those things that's gone backwards and forwards and backwards and forwards.

There was a paper arguing that we'd probably been overestimating various speeds, primarily based on footprints.

There's been, I don't know how many papers trying to do T-Rex speed.

The most recent one that was pretty detailed, I think had it clocked at...

So I think it was 25 miles an hour.

So 40 kph was the very upper end of the estimate.

So probably a bit less than that.

Well, that means it can move.

So...

But that's the thing.

Like, big things move quick.

I've seen rhino and hippo going at full tilt.

And yeah, they're a lot quicker than you'd think.

And at least part of it is simply stride length.

When your legs are three-ish meters long, it's hard not to cover a lot of ground with a single step.

And yeah, big, big theropods, T-Rex is going to be a power walker.

It's not going to run in the conventional biomechanical sense where both feet are off the ground at one point.

So it's not running as power walking.