What is the ground speed of an unladen Ent?

[Beren87]

That little jump is interesting,it makes me think of rockhopper penguins wich climb (sometimes quite high) rocks and come down from them while jumping all the way

*laughs at the mental image of an Ent doing that*

That's..not exactly what I meant, but sort of. I was thinking just as the lifted up their, say, left foot to step, they would push off a little with their right. This would enable them to have an increase in the elevation of their whole body, making less knee-bending.