2．Learn about killer whales. Q：What do you know about killer whales? Common name：Killer Whale Scientific name：Orcinus Orca Males can reach lengths up to 27 feet and can weigh up to 12,000 lb.You can tell an adult male from an adult female by the shape of their dorsal fin (male’s longer，up to 6 feet tall)． Killer whales are found in all oceans of the world.As a group，killer whales are known to eat fish，squid，seals，sea lions，penguins，even other whales.Thus，they are called “Killer Whales”．