One anecdote/example that has stuck with me is a heard of caribou in the Canadian north. In winter, they typically dig through the snow to find plants to eat. One year, with rising temperatures, a large area was left with a thick layer of ice on top of the snow. Precipitation was falling as rain (instead of snow) due to warmer temperatures, then freezing overnight creating this thick layer of ice. The caribou couldn't punch through the ice and ended up starving to death resulting in a mass die off.