Mammals, from the mighty blue whale to the tiny shrew, inhabit nearly every corner of our planet. Their remarkable adaptability to different environments has long fascinated scientists, with each ...

(Reuters) - Scientists in Australia have unearthed beautifully preserved fossilized hearts and other internal organs of ancient armored fish in a discovery that provides insight into the evolution of ...

Researchers have discovered a 380-million-year-old heart -- the oldest ever found -- alongside a separate fossilized stomach, intestine and liver in an ancient jawed fish, shedding new light on the ...