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Re: L'origine et l'évolution des oiseaux, with a twist
It can walk.
It can run.
It can leap.
It can glide.
No implied order to any of these activities, especially if arboreal.
Cursorial and arboreal at the same time? That I'd like to see.
I'm aware that "cursorial" doesn't mean "_can_ run" but rather "regularly
does it for a living"; but that's what the leg proportions of
*Sharovipteryx* suggest, if we kindly ignore the short toes and the patagium
which imply another possibility.