they sing because that is how they have conversations.
Whenever they feel the need to communicate. They sing for a variety of reasons, but their singing isn't the same as a human singing; We simply refer to their communication as singing.
they can sing for 80 hours!
Whales "sing" to talk to each other. Their song can carry for vast distances underwater. ( by sonic waves )
The cast of Where the Whales Have Ceased to Sing - 1993 includes: Josefin Nilsson
People are over fishing,poloting the water,and killing whales for blubber
becuase of the whales co2 tolerant blood and becuase of lactic acid fermentation, whales (like the sperm whale) are able to eat deep sea squid and fish.
yes
to communicate and find other whales like wolves but wolves do it to find there pack and whales do it to find there school or pod
hang upside down in the water
Yes sometimes
whales use echolocation to find each other and birds... i think to attract mates.
It is still a mystery to why humpback whales sing. One theory is that it could attract a possible mate. IT IS CERTAINLY A MYSTERY ON WHAT THEY SING ABOUT!