Extinct goat was cold-blooded (2009)
Some days ago there was news about some researchers predicting mammals would be doomed by the next supercontinent cycle, due to too high temperatures incompatible with warm blooded creatures. Well, if mammals can just evolve back cold blood, perhaps that makes their thesis moot. See <a href="https://news.ycombinator.com/item?id=37654289">https://news.ycombinator.com/item?id=37654289</a>