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RE: Claws of Troodontids
> (...) it seems likely that the sickle-claw was actually
> *lost* (...) and by certain troodontids.
_Borogovia_ has a rather straight claw - perhaps not good for predation.
Intraspecific combat, maybe? Just a guess.
_Tochisaurus_ has a reduced and very slender metatarsal II, making it
unlikely that it supported a sickle-claw-bearing toe.