Rick Baudé Wrote:
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> But...How do we know that the forward claw isn't
> used for fighting?

Since that leg and claw combined looks like a scythe, fighting would one more suggestion that would need to be falsified.

[www.nature.com]
1) David Peters: Closer to "Compsognathus and Tyrannosaurus, not with one of several included dromaeosaurs."
2) KK: "That big claw seems to have been used for deadlier things than perching."
3) LO: "Zs looks to me more like a small T-rex with feathers."
4) Rick: "fighting".

I just don't see anything that would demand climbing, perching, or pouncing from a fern/tree, especially with an animal as large as Zs.