This was an odd one, I read a while ago in a large collection.
The basic plot was that some time in the past the ability to open a portal through time was created. But the only thing that came of it was that a couple of Velociraptors made it through to the modern day. They were captured and eventually started breeding, and at some point people were like "Lets fry them up KFC style", and it was the most delicious food ever.
I think the whole story was written as obituary, or some other reflection on the recently deceased. Something like "I looked out at the tomb of my father: inventor, philanthropists and hero. Perhaps his greatest discovery was the Velociraptor, the most delectable fried creature ever to exist."
I think it was written by someone quite notable, Asimov, Silverberg, or someone else of that era. But I could be wrong.