Whale than males. Baleen whales have no teeth; instead they have plates of baleen, a fringe-like structure used to expel water while retaining the krill and plankton which they feed on. They use their throat pleats to expand the mouth to take in huge gulps of water. Balaenids have heads that can make up 40% of their body mass to take in water. Toothed whales, on the other hand, have conical teeth adapted to catching fish or squid. Baleen whales have a well developed sense of "smell", whereas toothed whales have well-developed hearing − their hearing, that is adapted for both
Captive killer whales of captive killer whales belong to the AMMPA, but exhibitors in other countries do not. The tanks in most marine parks are considerably larger than the minimum sizes required by regulations. However, the Miami Seaquarium has been criticized for the small size of the tank holding their sole killer whale, Lolita, which is less than two of her body lengths wide at any point. Building a new tank would be costly and there is little prospect of replacing the aging Lolita. On average, an adult killer whale in the wild may eat about three to four percent of their body