A 19-million-year-old fossil jaw bone hints the biggest whales first evolved somewhere unexpected - Phys.org
phys.orgSubmitted by physorg8953 in science
Baleen whales are the titans of the ocean, the largest animals to have ever lived. The record holder is the blue whale (Balaenoptera musculus), which can reach lengths of up to 30 meters. That's longer than a basketball court.