But the "quack" sounds have never been conclusively identified. Dr. Chapman says there are theories they were made by Antarctic Minke whales, since the sounds were also recorded in Antarctic ...

There are theories the sounds were made by Antarctic minke whales, since the sounds were also recorded in Antarctic waters in later years, but there was no independent evidence from visual ...

Mystery "quack-like" sounds detected in the ocean over 40 years may have been whales talking, suggests a new study. The noises were picked up in the Southern Ocean, off the coast of New Zealand ...