The blue whale is believed to be the largest mammal that ever lived.National Geographic: Blue Whale Profile A blue whale can weigh up to 200 tons and because of ...

Sperm Whales are large marine mammals.National Geographic: Sperm Whale There are three species of sperm whales: the giant sperm whale, the pygmy sperm whale and the dwarf sperm whale ...

The whaling controversy is the international environmental and ethical debate over whale hunting. The debate has focused on issues of sustainability and conservation as well as ownership and national sovereignty ...

Echolocation, also called biosonar, is the biological sonar used by several animals such as shrews, most bats, and most cetaceans. The term was coined by Donald Griffin ...

Sharks (superorder Selachimorpha) are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 420 million years ...