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This article states, “Scientists knew that some small carnivores hunted in packs . . . .” That sounds quite subjective to me. Finding many small theropods together with a possible victim can have many interpretations. Vultures mass at a carcass, but would you say they are pack hunters?

Russ Agreen
Danton, Md.

I can certainly understand the dinos hunting together and probably eating together, but dying together? What calamity caused an entire group to perish at once? A mudslide? A meteor? The salmon mousse? Is there any reason to believe that the bones found in this fossil were laid down within even 10 years of each other?

Lenny Foner
Somerville, Mass.