Scientists discover five-mn-year-old whale tooth
Scientists in Australia have discovered a five-million-year-old tooth of an extinct species of sperm whale estimated to be 40,000 kilograms in weight. The tooth, 30 centimeters long and weighing three kilograms, had the tip of its crown and some of its root missing. Scientists added that while ancient sperm whales hunted other whales, present-day sperm whales hunt squid and fish.