Whales were once hunted in small boats, some whales travel over 12,000 miles per year and have no teeth, and all whales need midwives. Blue whales are threatened by habitat loss, toxins, ship propellers, and fishing gear. The document discusses various facts about whales, such as their hunting history, migration patterns, teeth, birthing process, and threats like pollution and human activity. It also notes that blue whales are mammals that feed on krill and phytoplankton.