Crawling through Time: Fish bones reveal past climate change

The snakehead fish, best known lately as a threat to U.S. waters, may finally be doing some good. A German scientist asserts that fossils of relatives of the much-feared invader can shed light on major climatic changes of the distant past.

The air-breathing freshwater fish can crawl on its strong pectoral fins over land between lakes and rivers, taking over ecosystems that it moves into.