Dear Listers, I was alerted to this information by a news item on public radio. Ribbed mussels play a leading role in the integrity of salt marshes and feral swine are the nemesis. But I hadn’t heard about the wider threat of feral swine described in the accompanying video. David Kirsh Durham, NC https://www.savannahnow.com/story/news/2021/12/07/wild-hogs-mussels-coasts-climate-change/8881734002/