Whale food chain. They have large reserves of blubber, more so for toothed whales as they are higher up the food chain than baleen whales. Lactating mothers can pass the toxins on to their young. These pollutants can cause gastrointestinal cancers and greater vulnerability to infectious diseases. They can also be poisoned by swallowing litter, such as plastic bags. Advanced military sonar harms whales. Sonar interferes with the basic biological functions of whales—such as feeding and mating—by impacting their ability to echolocate. Whales swim in response to sonar and sometimes experience decompression sickness due to rapid changes in depth. Mass strandings
Types of modern dance Types of modern dance Modern dance is an evolution of choreography and performance that came after ballet. It can be divided into multiple types. This style was founded by dancer Lester Horton, who was born in 1906. Horton studied Native American dance in Indiana. Horton choreographed for theater and film. Horton studied the human body, and developed exercises focused on strengthening and preparing it for performances. A typical Horton class starts standing up with roll-downs and flat backs and later moves on to more complex moves. Alvin Ailey was one of Mr. Horton's students. Many companies use Horton including Alvin