Well...
One of the effects of a recent extinction level event is going to be on the animals/environment besides humans. 2-5 million years isn't an incredible length of time for stuff to bounce back and diversify - especially for the continent that the impact occurred on.
www.lpl.arizona.edu/impacteffects/
indicates a 22 mile impactor to get a 335 km crater (about twice the size of Dino-Killer) - that would have sterilized pretty much that continent. Life would have returned, but it'd be unusually uniform in comparison to what we're used to - everything would be evolved out of the survivors of the impact (more diverse the further timewise away from the impact).
You're right on the omnivore/carrion eater hypothesis for humans precursors to survive - after the end of the Cretaceous, minimal to no purely vegetarian or carnivorous animals appeared to have survived. Unfortunately, the Cretaceous impact killed pretty much everything larger than a housecat/small dog planetwide.
RMH
One of the effects of a recent extinction level event is going to be on the animals/environment besides humans. 2-5 million years isn't an incredible length of time for stuff to bounce back and diversify - especially for the continent that the impact occurred on.
www.lpl.arizona.edu/impacteffects/
indicates a 22 mile impactor to get a 335 km crater (about twice the size of Dino-Killer) - that would have sterilized pretty much that continent. Life would have returned, but it'd be unusually uniform in comparison to what we're used to - everything would be evolved out of the survivors of the impact (more diverse the further timewise away from the impact).
You're right on the omnivore/carrion eater hypothesis for humans precursors to survive - after the end of the Cretaceous, minimal to no purely vegetarian or carnivorous animals appeared to have survived. Unfortunately, the Cretaceous impact killed pretty much everything larger than a housecat/small dog planetwide.
RMH