Whales seen off Newfoundland include Pilot whales, minkes, sei whales, fin whales and humpbacks. Humpbacks, minkes, fin and blue whales are also frequently seen off Tadoussac. They primarily targeted right whales, but began catching humpbacks as right whale catches declined. Humpbacks are a friendly species that interact with other cetaceans such as bottlenose dolphins. Whale watchings targeting curious humpbacks are available. Like other cetaceans, humpbacks can be injured by excessive noise. Scars from orca attacks found on the flukes of humpbacks are also used in identification. Whale watching is the leisure activity of observing humpbacks in the wild. During the feeding season, humpbacks make unrelated vocalizations for herding fish into their bubble nets. Humpbacks have a , heart-shaped bushy blow through the blowholes. Humpbacks are an endangered species protected by U.S. federal and Hawaii state law. In the late 1870s, schooners began hunting humpbacks in the Gulf of Maine. The males do not compete as aggressively against each other as male humpbacks. Humpbacks have a diverse repertoire of feeding methods, including the bubble net technique. There are estimated to be about 22,000 humpbacks in the North Pacific.