Notes

One variety of singing whale is the blue whale. Like humpbacks, blue whales sing songs that marine biologists describe as ‘probably the most complex in the animal kingdom.’ Although they are the largest whales in the ocean, blue whales can move as fast as 48 kilometres per hour when interacting with other whales. However, this speed couldn’t help them escape from their human enemies, who hunted them until they nearly disappeared last century. Happily, laws now protect blue whales, and their numbers are increasing again. To delve deeper into the world of blue whales, to learn more about them, National Geographic scientists have connected cameras to blue whales in the ocean. The cameras, which don’t hurt the whales, have given scientists valuable information about the ways blue whales swim, eat, and sing. This information helps scientists better understand and protect blue whales.


Cameras on blue whales __________.

A ) don’t hurt them

B ) give useless information about them

C ) help them communicate with each other

D ) help us feed them