41. Multiple mutations have been identified in genes related to the production of enamel in modern baleen whales . 42. Last year, Norwegian whalers killed about 300 minke whales, which are the smallest of the baleen whales . 43. They are also known to interact with other baleen whales especially with Humpback whales or Bottlenose dolphins. 44. All frequently involved species are toothed whales ( Odontoceti ), rather than baleen whales ( Mysticeti ). 45. Gigi was the first captive baleen whale . 46. In contrast, baleen whales have evolved baleen plates to filter feed plankton and small fish from the water. 47. Minkes are the smallest of the baleen whales , reaching about 9 meters ( 30 feet ) in length. 48. Minke, the smallest of the baleen whales , can grow up to 9 meters ( 30 feet ) long. 49. Minke whales are the smallest of the baleen whales , growing to about nine meters ( 30 feet ). 50. Tadasu Yamada described the new, smaller-than-usual baleen whale species in this week's issue of the science journal Nature.