Trying to remember the title and author of a story I read at least 30 years ago. In the story, a team of researchers open a portal to another reality or dimension. They're observing what appears to be a nice human family in a pastoral setting. One of the researchers finds the scene so pleasant and beautiful that he jumps through the portal to meet them. As soon as they see him they all reveal massive sharp teeth, jump on him, and devour him. I want to say the story ends with the researchers somehow realizing that now the carnivores know how to reach our dimension, and an invasion is already starting.
Any ideas?
Any ideas?