Butterfish is a big problem for little puffins

Warmer seas have attracted a new fish to the Maine coast – but puffin chicks can’t stomach itEastern Egg Rock is a freezing speck of island that clings to the coast of Maine, north of Boston. It is fringed with a few bushes, has little soil and no supplies of fresh water. Yet this unprepossessing, seven-acre scrap of wave-washed granite is a site of major ecological interest. Thanks to research carried out here, scientists are gleaning invaluable – and alarming – data abo